Episode 26: Savana Ahoratra - a solar day - is not 24 hours! скачать в хорошем качестве

Episode 26: Savana Ahoratra - a solar day - is not 24 hours!

A savana ahoratra begins with sunrise. So says the Surya Siddhanta. We believe that a solar day is 24 hours, but in reality a solar day varies by less than a minute around 24 hours - sometimes less and sometime more than 24 hours. 24 hours is the average duration of a solar day across an entire year of 365 days. While the Earth spins on its axis at a steady speed, the Sun moves around the Earth at a variable speed (because its orbit is not circular but elliptical) thus causing the variation in the duration of solar days. 0:00 Opening narration 6:30 Stellarium animation 7:40 Solar day shorter than 24 hours 12:55 Solar day longer than 24 hours 17:34 Variation of the duration of solar days across an entire year 23:33 Variation of sunrise time across an entire year 26:43 Closing narration