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Posts Tagged ‘Sea of Crises’

09/25/2017 – Ephemeris – Lets look at the Moon tonight

September 25, 2017 1 comment

Ephemeris for Monday, September 25th. The Sun will rise at 7:33 a.m. It’ll be up for 12 hours exactly, setting at 7:33 p.m. The Moon, 2 days before first quarter, will set at 10:52 this evening.

Let’s take a look at the crescent Moon tonight. It will be fairly low in the southwestern sky this evening. Four of the gray lava plains called seas are now visible in binoculars or small telescopes. Nearest the right limb of the Moon is the Sea of Crises, next nearest if the Sea of Fertility. A small sea next to that is the Sea of Nectar. Above that, mostly exposed to sunlight is the Sea of Tranquility. The Sun is just rising at Tranquility Base, where Apollo 11 landed, where the Lunar Module’s descent stage still lies, forlorn and empty. Below that is the beautiful crater Theophilus with its central peak. It is 61 miles (101 km) in diameter, and its crater walls rise over 13,000 feet (4,400 meters) above the crater floor.

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

Addendum

The Moon tonight

The annotated crescent moon tonight, September 25, 2017. Created using Virtual Moon Atlas.  Click on the image to enlarge.

Apollo 11 landing site

The Apollo 11 landing site in one photograph by the Lunar Reconnaissance Orbiter. There are many with varying Sun angles in the Internet. Search for: Apollo 11 LRO images. Credit NASA.

05/12/2016 – Ephemeris – The Moon tonight

May 12, 2016 Comments off

Ephemeris for Thursday, May 12th.  Today the Sun will be up for 14 hours and 44 minutes, setting at 9:01.   The Moon, 1 day before first quarter, will set at 2:26 tomorrow morning.  Tomorrow the Sun will rise at 6:16.

The moon tonight is a fat crescent.  In binoculars the small Sea of Crises is prominently located as a gray patch at the edge of the moon.  The Sea of Fertility is below it, while the sea of Tranquility is between them and near the terminator, the sunrise line on the moon.  In telescopes there are three craters south of Tranquility, most prominent of which is Theophilus. With its prominent central peak.  Farther to the north of Crises and near the partially exposed Sea of Serenity is the crater Posidonius, larger than Theophilus, but has a double crater wall on one side.  Larger telescopes can see cracks in its floor .  It has no central peak, and shows its age of maybe three and a half billion years.

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

Addendum

The Moon tonight

The Moon at 10 p.m. May 12, 2016. Created using Virtual Moon Atlas.

05/10/2016 – Ephemeris – The lunar Sea of Crises

May 10, 2016 Comments off

Ephemeris for Tuesday, May 10th.  The Sun rises at 6:19.  It’ll be up for 14 hours and 39 minutes, setting at 8:59.  The Moon, 3 days before first quarter, will set at 1:04 tomorrow morning.

Tonight the Moon shows one remarkable sea:  Mare Crisium or the Sea of Crises.  It is a large gray basin.  The largest feature visible in binoculars.  Because it’s near the Moon’s limb or edge it is foreshortened into an ellipse, with the long axis running north and south.  In actuality it is elliptical with the long axis east and west.  It looks funny on a geologic map of the whole moon or a Moon globe.  Its dimensions are 345 by 375 miles (570 by 620km).  It’s really a crater as are all seas whose impact asteroid reached down to the Moon’s magma and caused lava to well up to produce the flat floor.  When the sunlight is low as it is now wrinkle ridges will appear showing where successive lava flows have stopped and solidified.

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

Addendum

Moon proper orientation

The Moon’s approximate orientation and phase at May 10, 2016. Created using Stellarium.

01/22/2015 – Ephemeris – Let’s spot the Moon and Mars with a bonus look at Neptune

January 22, 2015 Comments off

Ephemeris for Thursday, January 22nd.  The sun will rise at 8:11.  It’ll be up for 9 hours and 25 minutes, setting at 5:37.   The moon, 2 days past new, will set at 8:44 this evening.

Tonight the crescent moon is nearing Mars low in the southwest in the early evening.  The motion of Mars has been interesting for the last few months.  Even though the Sun is overtaking it in the sky, it has been setting later each night, not earlier.  This is due to the fact Mars is moving northeasterly in the sky, and the sun also is setting later.  The moon, is a thin crescent.  In binoculars, the terminator is crossing the small, near circular Sea of Crises near the top of the crescent.  Lower down, in binoculars and especially in small telescopes a beautiful crater of Langrenus is fully visible.  I have a picture of it from Apollo 8, a photograph from orbit.  It looks pretty much like it will be visible tonight only a lot clearer.

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

Addendum

Mars, the Moon and Neptune.

Magnified field with Mars, and the Moon. Neptune is also in the field for 7 p.m. January 22, 2015. Created using Cartes du Ceil (Sky Charts).

Telescopic Moon

The Moon with Earth shine at 7 p.m. January 22, 2015. Created using Virtual Moon Atlas and GIMP.

The crater Langrenus

The crater Langrenus as imaged by the Apollo 8 crew on their historic orbiting of the Moon Christmas Eve 1968. Credit: NASA.

 

 

03/04/2014 – Ephemeris – Observing the Moon tonight

March 4, 2014 1 comment

Ephemeris for Fat Tuesday, Tuesday, March 4th.  The sun will rise at 7:14.  It’ll be up for 11 hours and 19 minutes, setting at 6:34.   The moon, 3 days past new, will set at 10:52 this evening.

The Moon tonight is visible in the west after sunset.  The sunrise terminator is slowly moving across its face.  The solar day on the Moon equals its orbit of the Earth with respect to the sun of about 29 and a half days.  As the moon is oriented in our sky the dark nearly circular sea.  The Sea of Crises is rotated downward so it appear at between 4 and 5 o’clock on the moon’s face.  At the bottom is the partially uncovered Sea of Fertility.  With binoculars or preferably a small telescope can be seen  the large crater Langrenus close to the lunar equator.   A picture of that crater was one of the first brought back by the Apollo 8 crew in 1968.   I’ve found it for the blog entry for this episode at bobmoler.wordpress.com.

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

Addendum

The Moon

The moon rotated as if it were setting in the west showing the Sea of Crises (Mare Crisium) and the crater Langrenus. The image was enhanced to show Earth shine. Created using Virtual Moon Atlas.

The crater Langrenus

The crater Langrenus as imaged by the Apollo 8 crew on their historic orbiting of the Moon Christmas Eve 1968. Credit: NASA.

 

LRO image of Langrenus

The crater Langrenus as imaged by the Lunar Reconnaissance Orbiter. Credit: NASA\GSFC\Arizona State University.

Note on credits: GSFC is the Goddard Space Flight Center.

01/17/2014 – Ephemeris – The Moon tonight

January 17, 2014 1 comment

Ephemeris for Friday, January 17th.  The sun will rise at 8:14.  It’ll be up for 9 hours and 16 minutes, setting at 5:30.   The moon, 2 days past full, will rise at 7:23 this evening.  |  Let’s take a look at the moon as it’s still dominates the evening sky.  The terminator, now that it’s after full moon is the sunset line.  It is just starting to encroach on the small distinctive sea at the moon’s upper right edge called the Sea of Crises or Mare Crisium.  Where is is situated on the edge of the spherical moon it appears to be elongated north to south.  However if you saw it from overhead it would actually be elongated somewhat east to west.  On the terminator at the moon’s equator is a large crater called Langrenus with a central peak on the edge of the Sea of Fertility or Mare Fecunditatis, that should be an easy binocular and a great telescopic crater some 80 miles in diameter.  The smallest ting you can see on the moon in a small telescope is 2 miles in diameter.

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

Addendum

Moon

The Moon at 9 p.m., January 17, 2014. Created using Virtual Moon Atlas.

Moon

Mare Crisium as seen from overhead at 9 p.m., January 17, 2014. Created using Virtual Moon Atlas.

This last image cannot be seen without a spacecraft.  The image was created using data from the Clementine spacecraft.