Home > Ephemeris Program, The Moon, Venus > 04/17/2018 – Ephemeris – The Moon will appear near the planet Venus tonight

04/17/2018 – Ephemeris – The Moon will appear near the planet Venus tonight

April 17, 2018

Ephemeris for Tuesday, April 17th. The Sun rises at 6:55. It’ll be up for 13 hours and 35 minutes, setting at 8:30. The Moon, 2 days past new, will set at 10:27 this evening.

This evening, while viewing Venus the Moon will be to the left and below our evening star. It will be a thin sliver of a crescent and in the twilight there will be the suggestion that there is more than the thin sliver of the Moon visible. Binoculars will confirm that the entire disk of the Moon will be visible. The effect is called earthshine. The nearly full Earth is illuminating the Moon to a much greater degree than the full Moon illuminates the Earth. The ancients had a more beautiful way to put it: “The old Moon in the new Moon’s arms.” There is the same effect in the morning of the few days prior to the new Moon. The instant of new Moon occurred at 9:57 p.m. Eastern Daylight Time Sunday night the 15th. That’s the 16th according to Universal time. What does your calendar say?*

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Venus and the Moon

Venus and the Moon at 9 p.m. April 17, 2018. The Moon’s image has been enlarged two and a half times to show the earth shine and hint at the sliver of a crescent. Created using Stellarium.

* About the new moon this month.  I have two wall calendars.  One by NASA showing that the new moon occurred on April 16th based on Universal Time.  Universal Time (UT) used to be known as Greenwich Mean Time (GMT).  My other wall calendar is from the Old Farmers Almanac.  It shows the new moon to be on the 15th.  The almanac’s calendar pages are based on the location of Boston and the Eastern Time zone, standard or daylight saving.  The calendar seems to be similarly based.

The Moon phase calculations for these programs are created by a DOS version of my LookingUp program, which is by now over 20 years old.  I calculate them up a year at a time for the next year.  These are based, of course on the Eastern Time zone.

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