Moon ke Phases Kya Hain? (Purnima se Amavasya tak)
Kal raat poori roti, aaj kati hui roti: Chand ka chehra roz kyun badalta hai? 🌕🌗🌑
🧭 Is Post Mein
📖 Kahani: Sharad Purnima ki Kheer aur Subah ka Chand
Sharad Purnima ki raat thi. Golu ki Dadi ne kheer ka katora chhat par chandni mein rakh diya. Aasmaan mein ekdum gol, chamakta Chand tha, bilkul thaali jaisa. Priya boli, “Aaj Chand poora hai, isliye aaj Purnima hai.”
Agli subah Golu jaldi utha aur chhat par gaya. Sooraj poorab (East) mein nikal raha tha, aur paschim (West) ki taraf neeche… Chand abhi bhi dikh raha tha! “Arre, Chand toh raat ka hota hai, yeh subah kya kar raha hai?”
Ek hafte baad toh aur kamaal hua. Subah ke waqt Chand lagbhag sir ke upar tha, aur aadha dikh raha tha, jaise kisi ne roti ko beech se kaat diya ho. Rohan hanste hue bola, “Lagta hai kisi ne Chand ka aadha hissa kha liya!”
Dadi muskurayi: “Ab Krishna Paksha chal raha hai beta. Chand roz thoda ghatega, phir Amavasya aayegi, aur phir badhna shuru karega.”
Teen sawaal: Chand roz chhota-bada kyun dikhta hai? Krishna Paksha aur Shukla Paksha kya hain? Aur kya Chand sach mein kat jaata hai? Chaliye, aaj Chand ki “diary” padhte hain. 🔭
🎯 Is Post Mein Kya Seekhenge
- Moon ke phases (kalaayein) kise kehte hain
- Full Moon (Purnima) aur New Moon (Amavasya) kya hain
- Waning (ghatna) aur waxing (badhna): Krishna Paksha aur Shukla Paksha
- Crescent, half aur gibbous Moon ki pehchaan
- Ek poora cycle kitne din ka hota hai (lagbhag 29.5 din)
- NCERT ki “Chand ki diary” wali activity, step-by-step
🧱 Basics: Pehle Yeh Aana Chahiye
1. Chand (Moon) ek gol gend (sphere) jaisa hai. Woh chapta (flat) nahi hai, aur uska aakaar kabhi nahi badalta.
2. Chand ki apni roshni nahi hoti. Woh Sooraj ki roshni ko wapas bhejta (reflect karta) hai, jaise sheesha ya safed deewar karti hai. (Class 6–7 mein padha tha.)
3. Chand, Dharti (Earth) ke chaaron taraf ghoomta hai. Ek chakkar mein lagbhag ek mahina lagta hai.
4. Disha (direction): Sooraj poorab (East) mein ugta hai aur paschim (West) mein doobta hai. Yeh Dharti ke apni dhuri (axis) par ghoomne ki wajah se lagta hai.
💡 Concept: Moon ke Phases Kya Hain?
Step 1: Chand ko roz dekho. Agar aap ek mahine tak roz Chand ko dekhein, toh paayenge ki uska chamakta hua hissa (bright portion) har din thoda alag hota hai. Kabhi poora gol, kabhi aadha, kabhi patli si lakeer, aur kabhi bilkul gayab.
Step 2: Phases ki paribhasha. Dharti se dekhne par, Chand ke chamakte hisse ki roz badalti shakal ko Moon ke phases (Chand ki kalaayein) kehte hain.
Step 3: Do khaas din.
New Moon (Amavasya): jis din Chand bilkul nahi dikhta.
Step 4: Ghatna (Waning) — Krishna Paksha. Purnima ke baad chamakta hissa roz thoda kam hota hai:
Yeh lagbhag do hafte ka samay waning period hai. Bharat mein ise Krishna Paksha kehte hain.
Kyun “Krishna”? Krishna ka ek arth hai “kaala/gehra”. Is paksha mein raatein dheere-dheere andheri hoti jaati hain.
Step 5: Badhna (Waxing) — Shukla Paksha. Amavasya ke baad ulta hota hai:
Yeh waxing period hai. Bharat mein ise Shukla Paksha kehte hain.
Kyun “Shukla”? Shukla ka arth hai “safed/ujla”. Is paksha mein raatein roz zyada roshan hoti hain.
Step 6: Poora cycle. Ek Purnima se agli Purnima tak lagbhag 29.5 din lagte hain, yaani lagbhag ek mahina. Waning ke baad waxing, phir waning… yeh chakra (cycle) baar-baar, bina ruke chalta rehta hai.
Ek line mein: Phases = Chand ke chamakte hisse ki roz badalti shakal; Purnima → (Krishna Paksha, ghatna) → Amavasya → (Shukla Paksha, badhna) → Purnima, lagbhag 29.5 din mein.
🖼️ Diagrams: Picture se Samjho
🔐 Deep Concept: Quarter, Tithi aur “Aadha Chand”
1. Aadhe Chand ko “Quarter” kyun kehte hain? English mein aadhe chamakte Chand ko First Quarter (Shukla Paksha wala) aur Last Quarter (Krishna Paksha wala) kehte hain. Naam “quarter” (chautha hissa) isliye, kyunki us waqt Chand apne mahine bhar ke safar ka ek-chauthai (ya teen-chauthai) hissa poora kar chuka hota hai. Shakal aadhi, safar chauthai: dono alag baatein hain!
2. Ek paksha kitne din ka? Poora cycle lagbhag 29.5 din. Toh ek paksha ≈ 29.5 ÷ 2 ≈ 14.75 din, yaani lagbhag 15 din. Aur Purnima se aadhe Chand tak ≈ 29.5 ÷ 4 ≈ 7.4 din, yaani lagbhag ek hafta.
3. Tithi: Bharatiya panchang mein har paksha ko 15 tithiyon mein baanta jaata hai: Pratipada (1), Dwitiya (2)… Ekadashi (11)… aur aakhri tithi Purnima ya Amavasya. Do paksha = 30 tithi ≈ 29.5 din. Isiliye ek tithi poore 24 ghante ki nahi hoti, thodi chhoti hoti hai (29.5 din ÷ 30 ≈ 23.6 ghante, average mein).
4. Gibbous aur crescent ko kaise yaad rakhein? Crescent = aadhe se kam (hansiya/sickle jaisa). Gibbous = aadhe se zyada (phoola hua). Trick: “Gibbous = Greater than half”.
✏️ Examples: Kaunsa Phase hai? Waxing ya Waning?
Chamakta hissa sabse zyada. Iske baad Krishna Paksha shuru hota hai.
Chamakta hissa ghat raha hai, isliye waning. Aadhe se kam, isliye crescent.
Amavasya ke baad chamakta hissa badhta hai, isliye waxing.
Abhi aadhe se zyada chamak raha hai (gibbous), par roz ghat raha hai (waning).
Chamakta hissa humein bilkul nahi dikh raha.
Aadha Chand lagbhag 7 din par aata hai; 11 din par aadhe se zyada, aur Purnima abhi aage hai, toh badh raha hai.
⚖️ Difference Table: Waning vs Waxing
| Baat | Waning (Krishna Paksha) | Waxing (Shukla Paksha) |
|---|---|---|
| Chamakta hissa | Roz ghatta hai | Roz badhta hai |
| Kahan se kahan tak | Purnima → Amavasya | Amavasya → Purnima |
| Shakal ka kram | Poora → gibbous → aadha → crescent → gayab | Gayab → crescent → aadha → gibbous → poora |
| Samay | Lagbhag 2 hafte (≈ 15 tithi) | Lagbhag 2 hafte (≈ 15 tithi) |
| Raatein | Dheere-dheere andheri | Dheere-dheere roshan |
| Aasaani se kab dikhe (Activity se) | Subah, sooraj nikalte waqt | Shaam, sooraj doobte waqt |
🚫 Misconceptions: Log aisa sochte hain… lekin
❌ “Chand sach mein chhota-bada hota hai.”
✅ Sach: Chand hamesha poora gol hai. Sirf uska woh hissa jo humein chamakta dikhta hai, badalta hai.
❌ “Chand sirf raat ko nikalta hai.”
✅ Sach: kai dinon mein Chand din mein bhi dikhta hai, jaise Purnima ke baad subah, ya Shukla Paksha mein dopahar-shaam ko.
❌ “Amavasya ko Chand aasmaan se chala jaata hai.”
✅ Sach: Chand wahin hai, bas uska chamakta hissa humari taraf nahi hai, aur woh Sooraj ke bahut paas hone se dikhta nahi.
❌ “Har roz Chand ki shakal ek jaise kram mein badhti hi rehti hai.”
✅ Sach: lagbhag 15 din ghatti hai (Krishna Paksha) aur lagbhag 15 din badhti hai (Shukla Paksha).
❌ “Phases Dharti ki parchhai (shadow) ki wajah se hote hain.”
✅ Sach: nahi! Dharti ki parchhai se Chandra Grahan (lunar eclipse) hota hai, phases nahi. Phases ka asli kaaran hum Post 3 mein detail mein samjhenge.
🔤 Key Terms (Exam mein English shabd hi likhna)
❓ FAQs
1. Kya poori duniya mein ek din ek hi phase dikhta hai?
Lagbhag haan. Dharti ek din mein ek baar ghoomti hai, jabki Chand ka chakkar lagbhag ek mahine ka hai. Toh ek din mein Chand ki sthiti bahut kam badalti hai, aur alag-alag deshon ke log us din lagbhag ek hi phase dekhte hain. (Southern hemisphere wale use ulta-ghooma hua dekhte hain, par chamakta hissa utna hi hota hai.)
2. Purnima aur Amavasya ke beech kitne din hote hain?
Lagbhag 15 din (ek paksha). Poora cycle lagbhag 29.5 din ka hai, toh uska aadha ≈ 14.75 din.
3. Waxing aur waning ko kaise yaad rakhein?
Waxing = badhna (jaise mombatti ka “wax” jamta hai, badhta hai), Waning = ghatna (“wane” = kam hona). Hindi trick: Shukla = ujla hota ja raha (badhna), Krishna = andhera hota ja raha (ghatna).
4. Kya Amavasya ko Chand din mein upar hota hai?
Haan, Amavasya ke aas-paas Chand aasmaan mein Sooraj ke bahut paas hota hai, isliye din mein hi ugta-doobta hai. Par uska roshan hissa humari taraf nahi hota aur Sooraj ki tez chamak mein woh dikhta bhi nahi.
5. Bharat mein ye phases itne mashhoor kyun hain?
Kyunki hamare kai tyohaar aur panchang Chand ke phases par chalte hain: Diwali Amavasya ko, Holi aur Buddha Purnima, Purnima ko. Chand ka chakra samay naapne ki ek prakritik “ghadi” hai. (Iske baare mein Post 7 mein detail se padhenge.)
🧪 Activity (NCERT): Ek Mahine ki “Chand Diary”
Saamaan: ek copy, pencil, rubber, aur ek ghar ka bada (adult) saathi. Ghadi ya phone sirf time dekhne ke liye.
Kab shuru karein? Purnima ke agle din ki subah se. (Is saal: Purnima 26 October 2026 ko hai, toh 27 October ki subah se shuru kar sakte hain.)
Kya dikhega: pehle 2 hafte (subah) chamakta hissa roz ghatega aur Chand roz Sooraj ke paas aata dikhega. Lagbhag ek hafte baad subah aadha Chand sir ke upar hoga. Phir kuch din Chand dikhega hi nahi (Amavasya ke aas-paas). Uske baad shaam ko patla crescent dikhega, jo roz badhega aur Sooraj se door hota jaayega, jab tak Purnima na aa jaaye.
Nishkarsh: Chand ka chamakta hissa ek tay kram (order) mein ghatta-badhta hai, aur yeh chakra lagbhag ek mahine mein poora hota hai. Iska samay aur jagah bhi roz badalti hai (Post 2 mein detail).
Yeh activity NCERT ki Class 8 Science book Curiosity (Chapter 11) par aadharit hai, aur yahan apne shabdon mein samjhayi gayi hai.
🏠 Mini Experiments (Ghar pe)
Isse kya pata chala? Chand ka chakra lagbhag 29.5 din ka hai. Aadha din calendar mein nahi likh sakte, isliye kabhi 29, kabhi 30 aata hai.
8 chhote kaagaz lo. Har ek par ek gola banao aur upar wale Diagram 1 jaise kram mein shade karo: Purnima, gibbous, aadha, crescent, Amavasya, crescent, aadha, gibbous. Kaagaz ko kram se jod kar tezi se palto. Chand “ghatta-badhta” dikhega!
Har teesre din, ek hi jagah se, Chand ki photo lo (kisi bade ke phone se) aur taareekh likh lo. Mahine ke ant mein photos ko kram mein lagao. Aapke paas apna khud ka “phases chart” hoga.
🧠 Think Like a Scientist
Sawaal: Rohan kehta hai, “Crescent waale din Chand ka baaki hissa sach mein toot kar gayab ho jaata hai.” Ek scientist ki tarah ise kaise check karoge?
Scientist ka tareeka dekho
1. Observe (dekho): crescent waale din sirf ek patli chamakti lakeer dikhti hai.
2. Guess (anumaan): shayad baaki Chand wahin hai, bas us par Sooraj ki roshni humari taraf nahi aa rahi.
3. Test (jaanch): Amavasya ke 2–4 din baad, shaam ko andheri, saaf jagah se crescent ko dhyan se dekho (binoculars ho toh bade ke saath, Sooraj doobne ke baad hi).
4. Result: aksar crescent ke saath baaki gola bhi bahut halka, dhundhla sa dikh jaata hai. (Ise “earthshine” kehte hain: Dharti se reflect hui roshni us andhere hisse ko thoda roshan kar deti hai.)
5. Conclusion: Chand toota nahi hai, poora gol wahin hai. Sirf uska tez chamakta hissa humein kam dikh raha hai. 🔬
🌍 Real Life Mein Moon ke Phases
- 🪔 Tyohaar: Diwali Kartik ki Amavasya ko, Holi Phalgun ki Purnima ko, Buddha Purnima Vaishakh ki Purnima ko. Eid ka chand (patla crescent) dekh kar Eid manayi jaati hai.
- 📅 Panchang: Ekadashi, Purnima jaise din Chand ki tithi se tay hote hain. Dadi-Nani isi se vrat aur pooja ke din jaanti hain.
- 🌾 Gaon ki zindagi: pehle ke zamane mein bijli nahi thi, toh log Shukla Paksha ki roshan raaton mein safar ya kheti ka kaam kar lete the.
- 🔭 Taare dekhna: taare aur galaxy dekhne waale log Amavasya ke aas-paas ki raatein chunte hain, kyunki tab aasmaan sabse andhera hota hai.
- 🌊 Samudra: machhuaare Chand ke phases dekh kar jwaar-bhaata (tides) ka andaaza lagaate hain, kyunki tides bhi Chand se jude hain.
🔁 Recap: Poora Post Ek Nazar Mein
- Chand ki apni roshni nahi; woh Sooraj ki roshni reflect karta hai. Chand hamesha gol hai.
- Phases = Dharti se dikhne wale Chand ke chamakte hisse ki roz badalti shakal.
- Full Moon = Purnima (poora gol). New Moon = Amavasya (bilkul nahi dikhta).
- Waning / Krishna Paksha: Purnima → gibbous → aadha (≈1 hafta) → crescent → Amavasya (≈2 hafte kul).
- Waxing / Shukla Paksha: Amavasya → crescent → aadha → gibbous → Purnima.
- Crescent = aadhe se kam; gibbous = aadhe se zyada.
- Poora cycle ≈ 29.5 din (lagbhag ek mahina); ek paksha ≈ 15 tithi.
- Activity: subah (Purnima ke baad) chamak ghatti hai aur Chand Sooraj ke paas aata hai; shaam ko (Amavasya ke baad) chamak badhti hai aur Chand Sooraj se door jaata hai.
✍️ Fill in the Blanks
- Jis din Chand poora gol chamakta dikhta hai, use ______ kehte hain.
- Jis din Chand bilkul nahi dikhta, use ______ kehte hain.
- Chand ka chamakta hissa ghatne wale samay ko ______ period ya Krishna Paksha kehte hain.
- Aadhe se zyada chamakte Chand ko ______ kehte hain.
- Ek Purnima se agli Purnima tak lagbhag ______ din lagte hain.
- Chand ki apni roshni nahi hoti; woh ______ ki roshni reflect karta hai.
Answers
1) Full Moon (Purnima) · 2) New Moon (Amavasya) · 3) waning · 4) gibbous · 5) 29.5 · 6) Sooraj (Sun)
✅ True / False
- Chand ka asli aakaar roz badalta hai.
- Shukla Paksha mein Chand ka chamakta hissa badhta hai.
- Purnima ke lagbhag ek hafte baad Chand aadha dikhta hai.
- Crescent Moon mein aadhe se zyada hissa chamakta dikhta hai.
- Chand kabhi din mein nahi dikh sakta.
- Moon ke phases ka ek poora chakra lagbhag ek mahine mein poora hota hai.
Answers (kyun ke saath)
1) False: Chand hamesha gol hai; sirf dikhne wala chamakta hissa badalta hai.
2) True: Shukla Paksha = waxing, Amavasya se Purnima tak chamak badhti hai.
3) True: waning mein poore se aadhe tak lagbhag 1 hafta lagta hai.
4) False: crescent mein aadhe se kam chamakta hai; aadhe se zyada wala gibbous hai.
5) False: Purnima ke baad subah ya Shukla Paksha mein dopahar-shaam ko Chand din mein dikhta hai.
6) True: lagbhag 29.5 din.
🔘 MCQs
Q1. Chand ke chamakte hisse ki roz badalti shakal ko kya kehte hain? (a) Eclipse (b) Phases of the Moon (c) Orbit (d) Rotation
✅ (b) Phases of the Moon: yahi paribhasha hai.
(a) eclipse (grahan) kabhi-kabhi hota hai, roz nahi.
(c) orbit Chand ka ghoomne ka raasta hai, shakal nahi.
(d) rotation apni dhuri par ghoomna hai.
Q2. Amavasya ke baad Chand ka chamakta hissa: (a) ghatta hai (b) badhta hai (c) waisa hi rehta hai (d) laal ho jaata hai
✅ (b) badhta hai: Amavasya ke baad Shukla Paksha (waxing) shuru hota hai.
(a) ghatna Purnima ke baad hota hai.
(c) shakal roz badalti hai.
(d) phases mein rang nahi badalta.
Q3. Krishna Paksha kis period ka naam hai? (a) Waxing (b) Waning (c) Full Moon ka din (d) Grahan
✅ (b) Waning: Purnima se Amavasya tak chamak ghatti hai.
(a) waxing = Shukla Paksha.
(c) Purnima ek din hai, paksha 15 din ka hota hai.
(d) grahan ka paksha se seedha naam nahi juda.
Q4. Aadhe se kam chamakte Chand ko kya kehte hain? (a) Gibbous (b) Full Moon (c) Crescent (d) New Moon
✅ (c) Crescent: hansiye jaisa patla.
(a) gibbous aadhe se zyada hota hai.
(b) full moon poora gol hai.
(d) new moon mein kuch nahi dikhta.
Q5. Ek Purnima se agli Purnima tak lagbhag kitne din? (a) 7 (b) 15 (c) 29.5 (d) 365
✅ (c) 29.5.
(a) 7 din mein sirf poore se aadha hota hai.
(b) 15 din = ek paksha (Purnima se Amavasya).
(d) 365 din ek saal hai.
Q6. Purnima ke baad wali subah, sooraj nikalte waqt Chand kis disha mein dikhega? (a) Poorab (b) Paschim (c) Uttar (d) Dikhta hi nahi
✅ (b) Paschim (West): Purnima ke aas-paas Chand Sooraj ke lagbhag ulti taraf hota hai; Sooraj poorab mein ugta hai toh Chand paschim mein doob raha hota hai.
(a) poorab mein toh Sooraj hai.
(c) uttar sahi nahi.
(d) us subah Chand saaf dikhta hai.
Q7. Kis kram mein Chand ghatta hai? (a) Poora → crescent → gibbous → aadha (b) Poora → gibbous → aadha → crescent → Amavasya (c) Amavasya → crescent → aadha → poora (d) Aadha → poora → crescent
✅ (b): waning mein aadhe se zyada (gibbous), phir aadha, phir aadhe se kam (crescent).
(a) crescent gibbous se pehle nahi aa sakta.
(c) yeh badhne (waxing) ka kram hai.
(d) yeh koi sahi kram nahi.
Q8. Shukla Paksha mein Chand sabse aasaani se kab dikhta hai (Activity ke anusaar)? (a) Subah sooraj nikalte waqt (b) Shaam sooraj doobte waqt (c) Sirf aadhi raat ko (d) Kabhi nahi
✅ (b) Shaam ko: waxing Moon sooraj doobne ke waqt sabse aasaani se milta hai.
(a) subah waning Moon ke liye aasaan hai.
(c) “sirf aadhi raat” galat hai.
(d) Shukla Paksha mein Chand roz dikhta hai (shuru ke ek-do din chhod kar).
🔗 Assertion–Reason
Options: (a) A aur R dono sahi, aur R, A ko samjhata hai · (b) A aur R dono sahi, par R, A ko nahi samjhata · (c) A sahi, R galat · (d) A galat, R sahi
1. A: Krishna Paksha mein raatein dheere-dheere andheri hoti hain. R: Krishna Paksha mein Chand ka chamakta hissa roz ghatta hai.
✅ (a): chamak ghatne se hi raatein andheri hoti hain, isliye R, A ko samjhata hai.
2. A: Chand ka asli aakaar Purnima ko bada aur Amavasya ko chhota hota hai. R: Chand ki apni roshni nahi hoti, woh Sooraj ki roshni reflect karta hai.
✅ (d): A galat hai (Chand ka aakaar nahi badalta). R sahi hai.
3. A: Phases ka ek chakra lagbhag ek mahine ka hota hai. R: Sooraj roz poorab mein ugta hai.
✅ (b): dono sahi hain, par Sooraj ka poorab mein ugna phases ke ek mahine ke chakra ko nahi samjhata.
📝 Very Short Answer (1 mark)
1. Moon ke phases kise kehte hain?
Dharti se dikhne wale Chand ke chamakte hisse ki roz badalti shakal ko.
2. Waxing period ka Bharatiya naam kya hai?
Shukla Paksha.
3. Gibbous Moon kya hai?
Jab Chand ka aadhe se zyada hissa chamakta dikhe.
4. Full Moon day ko Hindi mein kya kehte hain?
Purnima.
5. Ek paksha lagbhag kitne din ka hota hai?
Lagbhag 15 din (≈ 14.75 din).
📝 Short Answer (2–3 marks)
1. Waxing aur waning mein do antar likho.
(1) Waxing mein chamakta hissa badhta hai, waning mein ghatta hai. (2) Waxing Amavasya se Purnima tak (Shukla Paksha), waning Purnima se Amavasya tak (Krishna Paksha) hota hai.
2. Crescent aur gibbous Moon mein kya fark hai? Har ek kab dikhta hai?
Crescent mein aadhe se kam hissa chamakta hai; yeh Amavasya ke aas-paas (pehle aur baad) dikhta hai. Gibbous mein aadhe se zyada chamakta hai; yeh Purnima ke aas-paas (pehle aur baad) dikhta hai.
3. “Chand ki shakal badalti hai” kehna poori tarah sahi kyun nahi?
Kyunki Chand ka asli aakaar hamesha gol hi rehta hai. Badalta sirf woh hissa hai jo humein Dharti se chamakta dikhta hai. Isliye sahi kehna hai: Chand ke chamakte hisse ki dikhne wali shakal badalti hai.
4. Purnima se shuru karke 4 phases kram se likho jo agle 2 hafton mein dikhenge.
Purnima → waning gibbous → aadha (last quarter) → waning crescent → Amavasya.
📝 Long Answer (5 marks)
1. Moon ke phases ko samjhao. Krishna Paksha aur Shukla Paksha ka varnan shakalon ke kram aur samay ke saath karo.
Phases: Chand khud chamakta nahi, Sooraj ki roshni reflect karta hai. Dharti se uska jo chamakta hissa dikhta hai, uski shakal roz badalti hai; ise phases kehte hain. Chand ka asli aakaar nahi badalta.
Krishna Paksha (waning): Purnima (poora gol) se shuru; chamak roz ghatti hai: gibbous → lagbhag 1 hafte mein aadha → crescent → lagbhag 2 hafte mein Amavasya (kuch nahi dikhta).
Shukla Paksha (waxing): Amavasya ke baad: crescent → lagbhag 1 hafte mein aadha → gibbous → lagbhag 2 hafte mein Purnima.
Samay: ek poora cycle lagbhag 29.5 din (ek mahina); har paksha lagbhag 15 din (15 tithi). Yeh chakra baar-baar chalta hai, isliye samay naapne mein kaam aata hai.
2. “Chand Diary” activity ka varnan karo: kab shuru karein, kya record karein, aur kya nishkarsh nikla.
Shuruaat: Purnima ke agle din, sooraj nikalte waqt, paschim mein Chand dhoondho.
Record: taareekh, kab dekha (subah/shaam), gole mein andhera hissa shade karke shakal, chamakta hissa kal se badha/ghata, Sooraj se doori kal se paas/door.
Tareeka: lagbhag 15 din subah dekho; jab subah na dikhe, toh agle 15 din shaam ko dekho.
Observation: subah chamak ghatti hai aur Chand roz Sooraj ke paas aata hai; ek hafte baad aadha Chand subah sir ke upar; kuch din nahi dikhta; phir shaam ko crescent jo roz badhta aur Sooraj se door jaata hai.
Nishkarsh: Chand ka chamakta hissa ek tay kram mein ghatta-badhta hai, aur yeh chakra lagbhag ek mahine mein poora hota hai.
📰 Case-Based Question
Ananya ke gaon mein 26 October 2026 ko Sharad Purnima manayi gayi. Uske Nanaji ne bataya ki agli Amavasya 9 November ke aas-paas hai, aur us mahine ki Diwali bhi isi Amavasya ke aas-paas aati hai. Ananya ne socha ki woh 27 October se roz subah Chand dekhegi aur copy mein uski shakal banayegi.
Q1. 27 October se 9 November tak Chand ka chamakta hissa badhega ya ghatega? Is paksha ka naam kya hai?
Ghatega. Yeh waning period, yaani Krishna Paksha hai.
Q2. Lagbhag kis taareekh ko Ananya subah aadha Chand dekhegi?
Purnima se lagbhag ek hafta (≈ 7.4 din) baad, yaani lagbhag 1–2 November ko (2 November ki subah achha mauka).
Q3. 9 November ke aas-paas use Chand kyun nahi dikhega?
Kyunki woh Amavasya (New Moon) hai; us din Chand ka chamakta hissa humein bilkul nahi dikhta.
Q4. Agli Purnima lagbhag kab aayegi? Hisaab lagao.
Ek cycle ≈ 29.5 din. 26 October + 29.5 din ≈ 24–25 November 2026. (Ya Amavasya 9 Nov + lagbhag 15 din ≈ 24 Nov.)
🚀 HOTS
1. Priya kehti hai, “Agar aaj aadha Chand hai, toh pakka 7 din baad Purnima hogi.” Kya woh sahi hai?
Zaroori nahi. Aadha Chand do baar aata hai: Shukla Paksha mein (iske lagbhag 7 din baad Purnima) aur Krishna Paksha mein (iske lagbhag 7 din baad Amavasya). Pehle yeh dekhna hoga ki chamak badh rahi hai ya ghat rahi hai, yaani waxing hai ya waning.
2. Agar Chand khud bulb ki tarah roshni deta, toh kya phases dikhte?
Nahi. Tab Chand ka har hissa khud chamakta, toh humein hamesha poora gol Chand dikhta. Phases isliye dikhte hain kyunki Chand sirf Sooraj ki roshni reflect karta hai, aur uska sirf woh aadha hissa roshan hota hai jo Sooraj ki taraf hai.
3. Ek bachcha Ekadashi (Shukla Paksha ki 11vi tithi) ki shaam ko Chand dekhta hai. Uski shakal kya hogi, aur kyun?
Waxing gibbous (aadhe se zyada, aur badhta hua). Kyunki Shukla Paksha mein lagbhag 7–8vi tithi par aadha Chand hota hai aur 15vi par Purnima; 11vi tithi in dono ke beech hai.
🏆 Olympiad Corner
1. 12 lagaataar Purnima-se-Purnima chakra kitne din ke hote hain? (a) 365 (b) 354 (c) 360 (d) 348
✅ (b) 354: 12 × 29.5 = 354 din. (a) 365 ek solar saal hai (yeh fark hum Post 5 mein padhenge). (c) 360 = 12 × 30 hota, par cycle 29.5 ka hai. (d) 348 = 12 × 29, galat.
2. Aaj Purnima hai. Lagbhag 18 din baad Chand kaisa dikhega? (a) Waning gibbous (b) Waxing crescent (c) Waxing gibbous (d) Full Moon
✅ (b) Waxing crescent: Purnima + ≈14.75 din = Amavasya. 18 din par Amavasya ko ≈3 din beet chuke hain, toh Chand patla aur badhta hua (waxing crescent) hoga. (a) waning gibbous Purnima ke turant baad hota hai. (c) waxing gibbous ≈ 23–28 din par aata hai. (d) agli Purnima ≈ 29.5 din par.
3. Inme se kaunsa jod galat hai? (a) Shukla Paksha – waxing (b) Krishna Paksha – waning (c) Gibbous – aadhe se kam (d) Amavasya – New Moon
✅ (c): gibbous aadhe se zyada hota hai, aadhe se kam crescent hota hai. (a), (b), (d) teeno jod sahi hain.
Har option pe tap karo, turant pata chalega sahi ya galat.
Q1. Full Moon (Purnima) se New Moon (Amavasya) tak lagbhag kitne days? (Poora cycle lagbhag 29.5 days)
(a) 29.5 days
❌ Galat: Poora cycle de diya: 29.5. Full se New sirf half: 29.5 ÷ 2 = 14.75.
(b) 7.375 days
❌ Galat: Chauthai cycle liya: 29.5 ÷ 4 = 7.375. Yeh Full se half Moon tak hai; New tak: 29.5 ÷ 2 = 14.75.
(c) 14.75 days
✅ Sahi! Full se New half cycle hai (waning). 29.5 ÷ 2 = 14.75 days, yaani lagbhag 2 weeks.
(d) 59 days
❌ Galat: Double kar diya: 29.5 × 2 = 59. Full se New half cycle: 29.5 ÷ 2 = 14.75.
Q2. Ek night Moon gibbous tha; 4 nights baad half Moon dikha. Yeh waxing hai ya waning?
(a) Waxing: bright part badh raha hai
❌ Galat: Gibbous se half ko badhna maana. Half gibbous se kam bright hai: waning.
(b) Waning (Shukla Paksha)
❌ Galat: Paksha ke naam badal diye. Waning = Krishna Paksha; Shukla Paksha waxing hai.
(c) Na waxing na waning
❌ Galat: Change ignore kiya. Bright part kam hua: waning.
(d) Waning (Krishna Paksha): bright part kam ho raha hai
✅ Sahi! Gibbous half se zyada bright, half usse kam: bright part ghat raha hai. Yeh waning hai, yaani Krishna Paksha.
Q3. Phases ke time Moon ka shape (sphere) badalta hai kya?
(a) Nahi; sirf humein dikhne wala bright part badalta hai
✅ Sahi! Moon hamesha sphere rehta hai. Earth se dikhne wala bright part badalta hai: isi ko phases kehte hain.
(b) Haan, Moon chhota-bada hota rehta hai
❌ Galat: Phases ko shape change maana. Moon ka size aur shape nahi badalta.
(c) Haan, New Moon pe Moon gayab ho jaata hai
❌ Galat: Na dikhne ko gayab maana. Moon wahin hai; bas uska bright part humein nahi dikhta.
(d) Moon flat disc hai, isliye kata hua dikhta hai
❌ Galat: Moon ko flat maana. Moon sphere hai, flat nahi.
Q4. Crescent aur gibbous Moon mein kya difference hai?
(a) Crescent half se zyada, gibbous half se kam
❌ Galat: Naam reverse kar diye. Patla crescent half se kam bright hota hai.
(b) Crescent half se kam bright, gibbous half se zyada
✅ Sahi! Crescent patla, half se kam bright. Gibbous half se zyada bright, par poora nahi.
(c) Crescent sirf waxing mein aata hai
❌ Galat: Crescent ko sirf waxing ka maana. Crescent waxing aur waning dono mein aata hai.
(d) Gibbous matlab Full Moon
❌ Galat: Gibbous ko poora Moon maana. Gibbous half se zyada bright, poora nahi.
Q5. Ek student ne Full Moon se Moon diary start ki aur 3 poore cycles tak likhi. Lagbhag kitne days?
(a) 87 days
❌ Galat: 29.5 ko 29 le liya: 29 × 3 = 87. Sahi: 29.5 × 3 = 88.5.
(b) 32.5 days
❌ Galat: Multiply ki jagah add kiya: 29.5 + 3 = 32.5. Sahi: 29.5 × 3 = 88.5.
(c) 88.5 days
✅ Sahi! Ek cycle (Full se agle Full tak) lagbhag 29.5 days. 3 cycles: 29.5 × 3 = 88.5 days.
(d) 90 days
❌ Galat: Cycle ko 30 days maana: 30 × 3 = 90. Cycle 29.5 hai: 29.5 × 3 = 88.5.
📚 Aur Padho (External Reference)
- NCERT Class 8 Science Curiosity, Chapter 11 (official PDF)
- DIKSHA: Sarkar ka free learning platform, NCERT ke videos ke liye
💖 CharuMam Motivation
Amavasya ki raat Chand dikhta nahi, lekin woh khatam nahi hota. Woh wahin rehta hai, aur ek-ek din, ek-ek kala badhte hue phir Purnima tak pahunch jaata hai.
Aapki padhai bhi aisi hi hai, beta. Kabhi lagega kuch samajh nahi aa raha, jaise andheri Amavasya. Ghabraiye mat. Roz thoda padhiye, roz ek “kala” badhaiye. Shukla Paksha ki tarah aapki samajh bhi dheere-dheere poori roshan ho jaayegi. 🌙✨
— CharuMam
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