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Posts Tagged ‘Earth shine’

09/11/2018 – Ephemeris – Earth shine on the Moon

September 11, 2018 Comments off

Ephemeris for Tuesday, September 11th. The Sun will rise at 7:16. It’ll be up for 12 hours and 43 minutes, setting at 8:00. The Moon, 2 days past new, will set at 9:27 this evening.

At around 8:30 this evening Venus will be in the southwest only 9 degrees above the horizon, about the width of a fist held at arm’s length. While viewing Venus the Moon will be to the right and above 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 earth shine. The nearly full Earth is illuminating the Moon to a much greater degree than the full Moon illuminates the Earth. The Earth is about 4 times the Moons diameter and its surface is about twice as bright and the Moon’s. The ancients called it: “The old Moon in the new Moon’s arms.”

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

Addendum

Venus, Moon and Jupiter

Venus, the Moon and Jupiter at 8:30 p.m. September 11, 2018. Created using Stellarium.

The Moon with Earth shine

An overly colored Moon to bring out Earth shine on thye evening of September 11, 2018. Created by Stellarium. Overly processed in GIMP.

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11/25/2016 – Ephemeris – The Moon is near Jupiter this morning

November 25, 2016 Comments off

Ephemeris for Friday, November 25th. The Sun will rise at 7:53. It’ll be up for 9 hours and 12 minutes, setting at 5:06. The Moon, half way from last quarter to new, will rise at 4:53 tomorrow morning.

The Moon passed Jupiter about 9 last night, and so this morning is to the left and a bit below the bright planet. The Moon is a waning crescent a bit less than 10% illuminated by the Sun from our vantage point. Or maybe it’s more proper to say we see less than 10% of its day lit side. The Earth is the only close object to it that can illuminate it’s night side, and that might be visible this morning as Earth shine. For the Moon the Earth is 90% illuminated by the Sun, exactly opposite its phase to us. It’s area in the Moon’s sky is 16 times the Moon’s area in our sky. On top of that the Earth is much more reflective than the Moon, which is dirty gray. So Earth light in the Moon is much brighter than moonlight on the Earth.

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

Addendum

Moon and Jupiter

Jupiter, the Moon, and the star Spica at 6:30 this morning, November 25, 2016. The Moon is shown twice actual size. Created using Stellarium.

Earth shine

The Moon with Earth shine with a confluence of planets (Venus, Jupiter, Mars) on June 15, 1991). Credit Bob Moler.