INDIAN GEOGRAPHY

Detailed explanation-1: -Galileo Galilei’s observations that Venus appeared in phases–similar to those of Earth’s Moon–in our sky was evidence that Venus orbited the sun and contributed to the downfall of the centuries-old belief that the sun and planets revolved around Earth.

Detailed explanation-2: -The phases are easily visible in a small telescope, especially the crescent phase. Venus is so bright, that it sometimes helps to look for the phases through your telescope in the dusk, when the twilight sky mutes its brightness. With care, you can see the crescent phase even in binoculars.

Detailed explanation-3: -A: Yes, Jupiter’s illumination occasionally dips below 100 percent, although the giant planet never appears less than 99 percent lit. Unfortunately, this phase effect is hardly noticeable through amateur telescopes except under exceptional observing conditions.