December Moon at Ascending Node

   Friday December 8th the waning gibbous Moon will be crossing the plane of the ecliptic moving north relative to the ecliptic. 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.


   On December 8th the 21-day old waning gibbous Moon will be within the boundaries of Leo the Lion and about 3o east from the ‘Heart’ of the Lion, the star Regulus.

   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)

Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   
   
   

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.

December Moon at Perigee


   Our Moon reaches perigee, (closest distance from Earth), for this orbit on Monday November 4th. At that time the Moon will be at a distance of 28.025 Earth diameters (367,492 km or 222,135 miles) from the Earth. This is approximately 17 hours after full Moon making this full Moon the year’s Super Moon.
   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*


   On the day of the perigee Moon the 16.5-day old waning gibbous Moon is above the eastern horizon about 1 hour after sunset local time. The Moon is located just east of Orion’s club and Orion appears to be swinging his club as if it were a baseball bat toward the Moon – but missed. Strike One!!.

   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   
   
   

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.

November Moon at Perigee


   Our Moon reaches perigee, (closest distance from Earth), for this orbit on Monday November 6th. At that time the Moon will be at a distance of 28.33 Earth diameters (361,438 km or 224,587 miles) from the Earth.
   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*


   On the day of the perigee Moon the 18-day old waning gibbous Moon is above the eastern horizon around 10:30 pm local time. The Moon is located just west of Orion’s club and Orion appears to be swinging his club as if it were a baseball bat toward the Moon.

   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   
   
   

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.

October Moon at Perigee


   Our Moon reaches perigee, (closest distance from Earth), for this orbit on Monday October 9th. At that time the Moon will be at a distance of 28.76 Earth diameters (366,855 km or 227,953 miles) from the Earth.
   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*


   On the day of the perigee Moon the 20-day old waning gibbous Moon is above the east to southeastern horizon around midnight local time.

   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   
   
   

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.

When the Moon Hits You In The Eye!


   Tuesday September 12th the 18-day old waning gibbous Moon will be once again poking Taurus the Bull in the eye! Actually the Moon will be within about 0.5o from the reddish star Aldebaran, the ‘angry eye’ of Taurus.
   
   
   
some extra Bob’s Space
   
   
   


   With binoculars the view of the Moon this close to Aldebaran and the rest of the v-shaped group of stars making up the open star cluster the Hyades should be as good as this graphic shows. But minus the blue lines!

   
   
   
   
   

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.

Dance of the Planets: 9 Sep. – Mercury & Regulus Conjunction

   This morning I set up my camera looking eastward along Highway 50. With city lights behind me, ‘Auto Row’ down the road, and a 19-day old waning gibbous Moon high over my right shoulder the sky was not really that dark. However pictures of visible planets and stars do not always have to be under dark skies or good seeing conditions. Adding to that were the low clouds along the horizon.
   This graphic shows the sky I had plans for imaging this morning, including Dwarf Planet Ceres near Pollux in the Gemini Twins. Plans had been to capture Mercury in conjunction with the star Regulus (check), and also Mars which this morning was closer to the horizon below Mercury (no check!). In the next few days Mars will be higher and easier to include in the group picture. Higher above the horizon and very bright with a -3.95 apparent magnitude was Venus.

   
   
   

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.

August Moon at Descending Node

   Tuesday August 8th the just past full Moon, a waning gibbous Moon, will be crossing the plane of the ecliptic moving south. This is known as the descending node, one of two intersections the Moon’s orbital path (dark green line) has with the ecliptic.
   

   On the day of the node crossing the 17-day old waning gibbous Moon will be over the east-southeast horizon an hour or so after sunset local time. The Moon will be about 10o from the outermost, (8th), planet Neptune.
   
   
   
   

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.