Sun is Not in Leo the Lion

   According to the pseudoscience of astrology, Sunday July 22nd the sun will be entering the constellation of Leo the Lion. In fact the Sun is still within the boundaries of the constellation Cancer the Crab, having just entered that region one day ago.
   The difference between the two locations of the Sun, the correct astronomical vs. the incorrect astrological, is due to the effects of precession, or more specifically, the precession of the Earth’s axis. The Earth wobbles on its axis like a spinning top does as the top slows down. So, in approximately 26,000 years the Earth will have spun, or wobbled one time. This is a repetitive cycle and over the course of one precession cycle the poles of the Earth trace out a circle against the background stars over their respective pole. any star on or nearest to this precession circle is the pole star. Currently the north pole of the Earth points toward Polaris and within this century, due to precession, will point the closest it will be, and then over time the Earth’s north pole will shift away.
   Another effect of precession has been to cause the celestial grid system to shift moving the original signs of the zodiac by at least one constellation to the west. In other words the Sun is more to the east which in effect means that whatever your zodiacal sign may be according to astrology, you are really the constellation to the west, or before it according to Astronomy.
   Click here to read a little more about precession from a previous blog.
   The Science of Astronomy has its roots in astrology with the origins of astrology beginning several millennia ago possibly by the Babylonians. Regardless of its origins the basis for at least Sun astrology, the popularized version printed in newspapers, is the position of the Sun relative to stars in the background. However we now know that due to the effects of precession the Sun’s position is no longer as it was during the beginnings of astrology.
    The slideshow below shows the sun’s position within Cancer on July 22nd 2016 AD, and then shifts to show the sun in Leo 4,000 years ago on 22 July 2016 BC. Precession has shifted the sun’s position one constellation to the west.

This slideshow requires JavaScript.

   
   
   

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.

Sun Does Enter Cancer the Crab

19july-view-from-earth   Saturday day July 21st the Sun in its apparent eastward motion along the ecliptic, moves out of the constellation Gemini the Twins and into the constellation of Cancer the Crab. 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.


Also Follow me and other great resources at Feedspot.

Circumstances for a Solar Eclipse


   Friday July 13th and Saturday the 14th circumstances are such that there will be a partial solar eclipse that will be best viewed from along the northern coast of Antarctica. (hey! every Antarctic coast is a northern coast!!
Specifically the partial solar eclipse will be visible at around 129o E near the Claire Coast.

   Circumstances for a solar eclipse, like for a lunar eclipse, require the Moon to be at either its ascending node or its descending node and be at or close to either new or full Moon phase. A node crossing occurs when the Moon with an orbit tilted 6o from the ecliptic (the Earth’s orbit) intersects the ecliptic.


   The Moon has an elliptically shaped orbit so if the timing for lunar apogee (furthest from Earth) or perigee (closest to the Earth) happens around a new Moon at a node crossing then the apparent size of the Moon will be anywhere from smaller to larger than the Sun’s apparent size. Smaller means a longer eclipse including the length of totality.


   
   
   However the bottom line is the timing between the node crossing and new Moon. This time the Moon crosses the ecliptic moving north, ascending node, approximately 24 hours after new Moon phase setting up a partial solar eclipse.

So what are the circumstances?
Times are in Universal Time (CDT = UT-5)
   July 13th
   1:48 UT – Partial Solar Eclipse Begins
   2:48 UT – New Moon — Partial Solar Eclipse
   3:01 UT – Mid-Eclipse (maximum Sun covered)
   4:13 UT – Partial Solar Eclipse Ends
   8:27 UT – Moon at Perigee – 357, 432 km (222,098 miles)
   July 14th
   2:52 UT – Moon at Ascending Node

   
   
   

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 Planetary Line-Up, Plus the Moon

   For the next week or so the evening skies will be filled with planets and dwarf planets. With the right timing and a relatively flat horizon you might be able to see Venus just before it sets and Mars just after it rises. A caveat to this is that as each day passes Mars will rise earlier while Venus, each day, will be setting earlier. And with the exception of Ceres the dwarf planets are too dim to be seen with the naked eye.

   As this graphic shows, the planets are closer to the ecliptic than the dwarf planets due to differences in the respective inclinations. Inclination: Every object orbiting the Sun has an orbital path that is tilted or inclined from the Earth’s orbit – the ecliptic.

   The waxing gibbous Moon is roughly mid-way between the red star Antares in Scorpius the Scorpion and the planet Saturn.

   
   
   

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.

June Moon at Ascending Node

   Saturday June 16th the 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 Saturday evening June 16th the 3.5-day old waxing crescent Moon will be about 8o east (left) from the planet Venus and about 3o from the open star cluster, M-44 also, known as the ‘Beehive Cluster’.

   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.

June Moon at Descending Node and Conjunction with Mars


   Sunday June 3rd the 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 morning of the node crossing the 19-day old waning gibbous Moon will be over the south-southeastern horizon about an hour before the Sun rises local time. The Moon will also be about 3o from the ‘red planet’ Mars. Off to the west is the planet Saturn nestled within the glow of the eastern side of the Milky Way.

   Depending on how dark the sky is where you are viewing from and how early you want to go outside, the area around Saturn is rich with some of the best deep-sky objects visible with binoculars. So the earlier you are out, before moonrise, the darker the sky will appear making it easier to see some of Messier Objects in the area near Saturn.

   
   
   
   
   

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.

Sun Not Really in Gemini

  According to the pseudoscience of astrology the Sun enters the constellation of the Gemini Twins on Monday May 21st. When in fact the actual position of the Sun on this date is still within the boundary of the constellation of Taurus the Bull, as this graphic and the banner graphic show.

   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 more observing information for this month.