July Moon at Descending Node

   Friday July 3rd the 11-day old waxing gibbous Moon crosses 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 date of the descending node the waxing gibbous Moon will be over the southern horizon around local time for sunset. Look for the Moon to be about 9-10o from the heart of Scorpius the Scorpion, the reddish star Antares.

   
   
   
   
   

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Leo and the Moon

   The next several evenings, as our Moon waxes through its phases, the Moon will pass by some familiar celestial objects – stars, star clusters, and planets. They all have something in common, that being that these objects are near the ecliptic. Our Moon follows the ecliptic in a more or less parallel path assuming that parallel paths may be bent! The Moon’s orbit is inclined or tilted about 6o from the ecliptic meaning that the Moon will at times be above, below, or on the ecliptic.
   So with the above in mind on the evenings of June 24th and 25th the 3 to 5-day old waxing crescent Moon will be passing by the heart of Leo the Lion, the bright star Regulus. As you can see from the graphic above Regulus lies nearly on the ecliptic.

   
   
   

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June Moon at Ascending Node and a Solar Eclipse

   Sunday June 21st the new 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.
   Whenever our Moon at either new or full phase crosses the plane of the ecliptic, a node crossing, there will be an eclipse of the Sun with a new Moon, or a lunar eclipse with the full Moon phase. On the 21st the new Moon will be aligned with the Sun for a solar eclipse. (Not visible from North America) However this solar eclipse is an annular solar eclipse, where at mid-eclipse the Moon does not completely cover the Sun. There is no ‘diamond bead’ effect, no corona like what is seen with a total solar eclipse. This is because the Moon and our Sun appear to be about the same size in the sky with the exception that the Moon’s orbit is more elliptical than the Earth’s orbit around the Sun. This means that the Moon can be closer or further away during a solar eclipse. With this annular solar eclipse the Moon is further away, appears smaller than the Sun, and at mid-eclipse leaves an annulus, a ‘ring of fire’ around the Sun as this animated graphic is showing.
Note, I have brightened the side of the Moon facing toward us. During a solar eclipse we would only see a silhouette of the Moon.

   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.


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June Solstice – 2020

   Northern hemisphere spring comes to an end and its summer begins on Saturday June 20st at 21:45 UT (4:45 pm CDT) when the Sun ‘reaches’ the celestial coordinates of 23.5o north declination and 6 hours right ascension. With respect to the Earth’s surface the Sun is described as over the Tropic of Cancer, 23.5o, north latitude of the Earth’s equator. At this same time according to astrology the Sun is said to be entering the boundaries of the astrological constellation Cancer the Crab. Actually it is not. Interestingly about 7 hours later, June 21st at 9 UT (4 am CDT) the Sun will actually be entering the region of the Gemini Twins as it crosses the boundary between Gemini and Taurus.

   We know that it is the Earth’s orbital motion around the Sun that causes the sun’s apparent eastward motion among the stars in the background. This is how the Sun ‘reaches’ a celestial coordinate, how it ‘crosses’ the boundaries between constellations, or how it is ‘in’ a constellation.

   With respect to the southern hemisphere this is the end of their summer and start of their fall season. So thinking globally my preference has been to use the name of the month to designate the season change. Hence the use of the term June Solstice rather than summer solstice.

   
      
   

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Sun Not Really In Cancer

   According to the pseudoscience of astrology the Sun enters the constellation of Cancer the Crab on Sunday June 21st at 9 UT (4 am CDT). When in fact the actual position of the Sun on this date is still within the boundary of the constellation of Taurus the Bull, but by very little. The Sun is very close to the eastern boundary for Taurus and the western boundary for the Gemini Twins, as this graphic and the banner graphic at the top of the page shows.
   Interestingly the June solstice was yesterday
   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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Penumbral Lunar Eclipse

penumbral-eclipse-ani   At 17:45 UT (12:45 am CDT) Friday June 5th the full Moon will start passing through the Earth’s shadow setting up the condition for a lunar eclipse. Approximately 24 hours later the just past full Moon will be at its descending node, the orbital point where the Moon’s inclined orbit crosses, or intersects the Earth’s orbit.
   This penumbral lunar eclipse will not be visible from North and South America.
   Click here to go to the Hermit Eclipse web site for an interactive map showing where this eclipse will occur.

   
   
   
   

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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June Moon at Descending Node

   Saturday June 6th the 14.7-day old waning gibbous Moon crosses 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 date of the descending node the waning gibbous Moon will be just getting ready to set about an hour or so before sunrise. To the east are three of the visible planets, Jupiter, Saturn, Mars. Dwarf Planet Ceres, and Neptune are also part of the line-up along the ecliptic, but both have apparent magnitudes too dim to be naked-eye visible.

   
   
   
   
   

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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Sun Not in Gemini

  According to the pseudoscience of astrology the Sun enters the constellation of the Gemini Twins on Wednesday May 20th. 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.

Sun Enters Taurus the Bull – 2020

   Wednesday May 13th 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 Descending Node

   Sunday May 10th the 17-day old waning gibbous Moon crosses 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 date of the descending node the waning gibbous Moon will be above the southern horizon at sunrise and will be near the western edge of the Milky Way. However the Moon’s reflected sunlight dims out the glow of the Milky Way. To the east are 4 of the visible planets, Jupiter, Saturn, Mars. Dwarf Planet Ceres, and Neptune are also part of the line-up along the ecliptic, but both have apparent magnitudes too dim to be naked-eye visible.

   
   
   
   
   

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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