चन्द्र ग्रहण

thumb|200px|right|chandr grahan
Moon Eclipse chandrama aur soory ke bich mean prithvi ke a jane ko hi chandr grahan kahate haian. chandr grahan tab hota hai, jab soory v chandrama ke bich prithvi is prakar se a jati hai ki prithvi ki chhaya se chandrama ka poora ya aanshik bhag dhak jata hai. jab is sthiti mean prithvi soory ki kiranoan ke chandrama tak pahuanchane mean avarodh laga deti hai to prithvi ke us hisse mean chandr grahan nazar ata hai. is jyamitiy pratibandh ke karan chandr grahan keval poornima ki ratri ko ghatit ho sakata hai.

prakar

chandr grahan ka prakar evan avadhi chandr asandhiyoan ke sapeksh chandrama ki sthiti par nirbhar karate haian. chandr grahan do prakar ka nazar ata hai-

1. poora chandrama dhak jane par 'sarvagras chandragrahan'
2. aanshik roop se dhak jane par 'khandagras (upachchhaya) chandragrahan'

prithvi ki chhaya soory se 6 rashi ke antar par bhraman karati hai tatha poornamasi ko chandrama ki chhaya soory se 6 rashi ke antar hote hue jis poornamasi ko soory evan chandrama donoan ke aansh, kala evan vikala prithvi ke saman hote haian arthat ek sidh mean hote haian, usi poornamasi ko chandr grahan lagata hai.

avadhi

vishv mean kisi soory grahan ke viparit, jo ki prithvi ke ek apekshakrit chhote bhag se hi dikh pata hai, chandr grahan ko prithvi ke ratri paksh ke kisi bhi bhag se dekha ja sakata hai. jahaan chandrama ki chhaya ki laghuta ke karan soory grahan kisi bhi sthan se keval kuchh minatoan tak hi dikhata hai, vahian chandr grahan ki avadhi kuchh ghanto ki hoti hai. isake atirikt chandr grahan ko soory grahan ke viparit kisi vishesh suraksha upakaran ke bina nangi aankhoan se bhi dekha ja sakata hai, kyoanki chandr grahan ki ujjvalata poorn chandr se bhi kam hoti hai.

panne ki pragati avastha

adhar

prarambhik

madhyamik

poornata

shodh