The phases of Venus. ... If you'd like to test your own perception of vision on Venus, the best time to try it would be during bright twilight, say 15 to 30 minutes before sunrise.

These phases reverse order when Venus reappears in the morning sky. The International Year of Astronomy marks the 400th anniversary of Galileo’s use of a telescope to observe the skies.

The phases of Venus. ... If you'd like to test your own perception of vision on Venus, the best time to try it would be during bright twilight, say 15 to 30 minutes before sunrise.