# Why we not consider Brahma's night kalpa?

Why do we consider only the day kalpa of Brahma?

1 kalpa = One day of Brahma

2 kalpa = One day + Night of Brhama

according to this "2 kalpa = One day + Night of Brhama" we are in 101 Kapla of Brahma

I have some confusion regarding this, so tell me why we consider only day kalpa of Brahma?

• Because Kalpa is not a unit of time, it's a specific period. A day of Brahma is called a Kalpa, and a night of Brahma is called a Pralaya. They're the same length if time, but creation goes on in one of them and destruction goes on in the other. – Keshav Srinivasan Aug 4 '15 at 4:58
• ok means we can not consider pralaya in our calendar..., but when we want to calculate how many years ago loard rama was born in this calculation we consider pralaya or not ? – Bhavin Patel Aug 4 '15 at 5:13
• Well, Rama lived in the present Vaivasvata Manvantara, as I discuss in my answer here: hinduism.stackexchange.com/a/7189/36 So there's no Pralaya in between. But yeah, if we want to calculate the time between some event in some previous Kalpa and some event in the present Kalpa, we would need to add the lengths of the Pralayas in between. – Keshav Srinivasan Aug 4 '15 at 5:18