Home > Ephemeris Program, The Moon > 07/11/2016 – Ephemeris – Checking out a crack on the Moon

07/11/2016 – Ephemeris – Checking out a crack on the Moon

July 11, 2016

Ephemeris for Monday, July 11th.  Today the Sun will be up for 15 hours and 19 minutes, setting at 9:27, and it will rise tomorrow at 6:09.  The Moon, at first quarter today, will set at 1:24 tomorrow morning.

Mostly when discussing the features visible on the Moon, I talk about craters.  This feature, visible close to the terminator, the sunrise line on the moon is a rille or what appears as a long meandering groove.  It’s called the Hyginus Rille, a 133 mile (220 km) long, 2 mile (4 km)  wide groove with a small crater near the center named Hyginus.  The crater doesn’t look like a normal collision caused crater.  It has no raised crater walls.  The best guess as to what the Hyginus Rille is a collapsed lava tube.  Parts of the lava tube may be intact as the groove devolves into a line of craters. Lava tubes may be used as lunar bases since they can serve as protection from meteoroids, radiation and temperature swings of the lunar day/night cycle.

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


The Moon

The Moon at 10:30 p.m. July 11, 2016 with the location of the Hyginus Rille located. Created using the Virtual Moon Atlas.

Hyginus Rille

Closeup of the Hyginus Rille using the Lunar Reconnaissance Orbiter texture on the Virtual Moon Atlas.

  1. July 12, 2016 at 8:36 pm

    There is such a great amount in this article I would never have considered all alone.

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