Math links

alternative theories to big bang

what before big bang

https://www.youtube.com/watch?v=PWxcgJUCDxg

http://aether.lbl.gov/www/tour/elements/stellar/stellar_a.html

good summary of universe formation http://pages.uoregon.edu/jimbrau/astr123/Notes/Chapter27.html

Excellent videos 

About Seasons on Earth

About precision of Earth

Excellent-Gyroscope

Earth's rotation 

https://en.wikipedia.org/wiki/Solar_calendar 

Panchangam Calender

http://www.pbslearningmedia.org/resource/nvsn5.sci.space.star/the-star-in-you/