Have you noticed something missing lately? Venus has been absent from view since late last summer. We last saw it struggling against the solar glare at dawn.
Now, just in time for the holidays, Venus is returning to the evening sky, low in the southwest after sundown. Tonight there’s even a chance to see it next to an exceptionally thin crescent moon.
Look for the goddess of beauty and love to meet up with the moon some 20 minutes after sundown low in the southwestern sky. Most of us consider seeing a day-old crescent moon quite a feat, but from the Midwest this evening, Luna will be just 21 hours old, a fragile crust if ever there was and a chance to break your personal young moon record.
I’d bring binoculars just to be sure you see the two. Venus will be only 6° above the horizon this evening. Make slow horizontal sweeps with your binoculars to the left of the brightest part of the lingering glow of sunset. As long as the sky is haze-free, Venus should pop into view. Once you’ve nailed it, move to the upper right in the field of view and locate the moon. Now, lower the binoculars and try sighting both with your naked eye alone.
Venus underwent superior conjunction on October 25th, when it lined up with the Sun on the opposite side of its orbit from Earth. It was most distant from us then and appeared like a tiny full moon. The planet’s still pretty far away and will remain near the Sun in evening twilight for the next month or so. Although Venus’ orbital speed varies little over its nearly circular orbit, it appears to travel very slowly this winter because it’s very far from us.
Fear not! Its appearance this month is a harbinger for this spring and early summer’s exceptional apparition when the brightest of the planets will catch your eye in the west all evening long.
Looking at the diagram, notice that Venus, moving faster than Earth because it’s closer to the Sun, is slowly catching up with our planet. As it does, the angle it makes to Sun and Earth continuously changes which changes the appearance of Venus. Through a small telescope we can easily see its phase shrink from full to half to crescent exactly like the phases of the moon.
Venus is famous creating spectacular scenes with other bright planets and the moon. We call these events conjunctions. I’ve illustrated a few of them above. The best will occur on July 1st when the sky’s two brightest planets will be just 0.4° apart.
I love it when Venus returns to view. It always puts a bright face on every clear night.