About Bob Riddle

Currently: Retired Teacher (May 2017) but not yet finished learning and teaching. Column Editor, Scope on the Skies - Science Scope Magazine; NASA/JPL Solar System Educator Program - Solar System Ambassador Program, and Solar System Ambassadors Program.

Sun Enters Taurus

   Tuesday May 14th the Sun in its apparent eastward motion along the ecliptic, moves out of the constellation Aries the Ram and into the constellation of Taurus the Bull. This is the true or actual position of the Sun as opposed to the pseudoscience of astrology which usually has the astrological Sun one constellation ahead or east from the Astronomical Sun’s position.

Read a little more about how astrology has the Sun incorrectly placed in a previous blog, and in another blog discussing the effects of precession.


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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May Moon at Apogee

   Our Moon reaches perigee, (closest distance to Earth), for this orbit, on Monday May 13th. At that time the Moon will be at a distance of 28.93 Earth diameters 229,296 miles (369,017 km) from the Earth.

   The 9-day old waxing gibbous, Moon rises around mid-afternoon and sets the following day, and is visible all night.

   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)

   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.


Also Follow me and other great resources at Feedspot.

Give Mom a Diamond

   About an hour after local sunset, on Mother’s Day May 12th, go outside and face south and look for the 8-day old waxing gibbous Moon to be near the star Regulus. Then look for the bluish-white colored star Spica.
   Spica, a star in Virgo the Harvest Maiden, marks the lower corner of an *asterism known as ‘the Diamond of Virgo’. To see the asterism look up to the left from Spica for the reddish star Arcturus in the kite-shaped constellation Bootes the Herdsman. Then look nearly straight up, the zenith, for the dimmest of the diamond stars, Cor Caroli in Canes Venatici, the Hunting Dogs. Then look down to the right for the star Denebola, the tail of Leo the Lion.
   Look toward the western horizon for a reddish star, actually the ‘Red Planet’ Mars.

*An asterism is a group of stars forming a recognizable pattern using stars within a constellation or by combining stars from more than one constellation. For example, the Big and Little Dipper are asterisms.

   
   
   

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.

Waxing Gibbous Moon Passes Regulus

   Saturday and Sunday May 11-12th the waxing gibbous Moon will pass by the star Regulus, the ‘heart’ of Leo the Lion.

   
   
   

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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Waxing Crescent Moon Near Beehive Cluster

   Friday evening May 10th the 6-day old waxing crescent Moon will be ‘on top’ of the open star cluster, M-44, or the Beehive Cluster. This should make for a great viewing sight through the field of view of binoculars or telescope, and certainly would make for a striking astrophoto.

   
   
   

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.

Waxing Crescent Moon and the Twins

   Thursday evening May 9th the 5-day old waxing crescent Moon will be about 4-5o from the star Pollux, one of the two Gemini ‘Twin’ Stars. The Moon and Pollux will fit within the field of view of 7×50 binoculars however the other ‘Twin’ star Castor is out of that field of view.

   
   
   

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.

May Moon at Ascending Node

   Thursday May 9th the 5-day old waxing crescent 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 the day of the node crossing the 5-day old waxing crescent Moon rises around mid-morning and sets the following day.

   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.


Also Follow me and other great resources at Feedspot.