January Moon at Perigee

   Our Moon reaches perigee, (closest to Earth), for this orbit, on Monday January 13th. At that time the Moon will be at a distance of 28.69 Earth diameters, 227,396 miles (365,958 km) from the Earth.

   On the day of the perigee Moon the 19-day old waning gibbous Moon will be over the eastern horizon late in the evening.

   Does our Moon actually go around the Earth as this graphic shows? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to go to bobs-spaces.


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From a Crab to a Lion

   Over the next two evenings, January 11th and 12th, the waning gibbous Moon moves from near the Beehive Cluster, M-44, an open star cluster in Cancer the Crab to near the bright star Regulus in Leo the Lion. M-44, with an apparent magnitude of 3.50 in a dark sky without the Moon nearby is visible to the unaided eye and is easily seen with optical assistance like binoculars, or a low-power wide field eyepiece.


   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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The Moon and the Twins


   Thursday evening January 10th the 16-day old waning gibbous Moon will be about 6-7o from the star Pollux. Pollux is one of the two Gemini Twin stars.

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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December Moon at Perigee

   Our Moon reaches perigee, (closest distance to Earth), for this orbit, on Wednesday December 18th. At that time the Moon will be at a distance of 26.025 Earth diameters, 230,069 miles (370,260 km) from the Earth.

   On the day of the perigee Moon the 22-day old waning gibbous Moon will be over the south-southwestern horizon at sunrise local time. The planet Mars is also visible over the southeastern horizon. If your local eastern horizon is low enough then the innermost planet, Mercury, might be seen near the reddish star Antares in Scorpius the Scorpion.

   Does our Moon actually go around the Earth as this graphic shows? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to go to bobs-spaces.


Also Follow me and other great resources at Feedspot.

Moon on the Move

   Over the next few evenings, Saturday December 14th, Sunday the 15th, and Monday the 16th the waning gibbous Moon will orbit eastward starting from about 7-8o south of Pollux to passing about 6-8o from M-44, the ‘Beehive Cluster’, an open star cluster in the constellation Cancer the Crab. By Monday the 16th the waning gibbous Moon will be about 2o from the heart of Leo the Lion, the star Regulus.
   During a 24-hour rotation of the Earth the Moon will have moved approximately 15o eastward. In terms of Moon position that 15o is equal to one hour — (divide 360o by 24 hours = 15o). What this has to do with the Moon’s position is that each day or night the Moon rises about 1 hour earlier. These 3 graphics show the effect of this in that it will be about 1 hour later for the Moon to be more or less in the same spot in the sky relative to the horizon.

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


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December Moon at Ascending Node

   Friday December 13th the 17.5-day old waning gibbous Moon rises between the legs of the Gemini Twins. The Moon will be about 10-11o to the west from the ‘Twin’ Stars Pollux and Gemini. As it is rising the Moon will be crossing the plane of the ecliptic moving north. This is known as the ascending node, one of two intersections the Moon’s orbital path has with the ecliptic. The ecliptic is actually the Earth’s orbit and the Moon’s orbit is inclined about 6o from the ecliptic. So there are two node intersections, the ascending and descending nodes.

   Does our Moon actually go around the Earth as many graphics show? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
*Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


Also Follow me and other great resources at Feedspot.

A Pair of Conjunctions

   Sunday November 24th there will a photo or viewing opportunity during the twilight hour before the Sun rises and after the sun has set. Starting off the day will be a conjunction involving the very thin waning crescent Moon near the ‘Red Planet’ Mars. The two will be separated by about 3-4o. Lower or to the east is the innermost planet Mercury.
   Then, approximately 12 hours later, the Sun has or is about to set and over the western horizon is a cluster of 3 planets. Close together and separated by about 1-2o are the planets Jupiter and Venus. Higher or to the east is the planet Saturn.
    Both of these conjunctions will look great through binoculars or a wide-field eyepiece on a telescope, and obviously will make for interesting pictures.

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.


Also Follow me and other great resources at Feedspot.