Astronomy – Ch. 2 Understanding the Night Sky (19 of 23) Tropical Year vs Sidereal Year

Astronomy – Ch. 2  Understanding the Night Sky (19 of 23) Tropical Year vs Sidereal Year

Astronomy – Ch. 2 Understanding the Night Sky (19 of 23) Tropical Year vs Sidereal Year

31 Δεκεμβρίου 2015
[ot-video][/ot-video]