08/31/2015 – Ephemeris – Previewing the skies of September – Part 1

Ephemeris for Monday, August 31st.  The Sun will rise at 7:03.  It’ll be up for 13 hours and 18 minutes, setting at 8:21.   The Moon, 2 days past full, will rise at 9:31 this evening.

Let’s look forward to the skies of September. The sun will moving at its greatest speed in its retreat to the south. Daylight hours in the Interlochen/Traverse City area and will drop from 13 hours and 15 minutes tomorrow the 1st. to 11 hours 46 minutes on the 30th. The altitude of the sun above the southern horizon at local noon will be 54 degrees tomorrow, and will descend to 42 degrees on the 30th. The Straits area will see the sun a degree lower.  The season of summer is getting short, so enjoy it while you can. Summer ends and autumn begins at 4:20 a.m. on September 23rd.  Saturn is setting before midnight now, but Venus and Mars are appearing in the morning sky soon.  Tomorrow we’ll look at September’s lunar eclipse.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location

Addendum

Star Chart for September 2015. Created using my LookingUp program.

The planets and stars are plotted for the 15th at 10 p.m. EDT.  That is chart time.  Note, Traverse City is located 1 hour 45 minutes behind our time meridian.  To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.

Evening astronomical twilight ends at 10:04 p.m. EDT on August 1st, decreasing to 9:02 p.m. EDT on the 30th..

Morning astronomical twilight starts at 5:19 a.m. EDT on August 1st, and increasing to 6:01 a.m. EDT on the 30th.

Add a half hour to the chart time every week before the 15th and subtract and hour for every week after the 15th.

For a list of constellation names to go with the abbreviations click here.

The green pointer from the Big Dipper is:

• Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
• Follow the arc of the Big Dipper’s handle to Arcturus.
• The Summer Triangle is shown in red.

Calendar of Planetary Events

Credit:  Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC)

To generate your own calendar go to http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html

Times are Eastern Daylight Time on a 24 hour clock.  Some additions made to aid clarity.

Conjunctions like the Mars-Regulus: 0.8° N means Regulus will appear 0.8° north of Mars.

Sep	01	Tu		Venus: 25° W
	04	Fr	05:59	Mercury Elongation: 27.1° E
	05	Sa	01:09	Moon-Aldebaran: 0.6° S Occultation?*
	05	Sa	05:54	Last Quarter
	06	Su	13:06	Moon North Dec.: 18.2° N
	10	Th	01:53	Moon-Venus: 2.9° S
	13	Su	02:41	New Moon
	13	Su	02:55	Partial Solar Eclipse (Southern tip of Africa to Antarctica)
	14	Mo	00:38	Moon Ascending Node
	14	Mo	07:28	Moon Apogee: 406500 km
	18	Fr	22:54	Moon-Saturn: 3.1° S
	21	Mo	04:59	First Quarter
	21	Mo	08:02	Moon South Dec.: 18.1° S
	23	We	04:20	Autumnal Equinox
	24	Th	15:38	Mars-Regulus: 0.8° N
	27	Su	17:04	Moon Descending Node
	27	Su	21:46	Moon Perigee: 356900 km – Super moon
	27	Su	22:48	Total Lunar Eclipse
	27	Su	22:50	Full Moon – Harvest Moon
	30	We	10:36	Mercury Inferior Conjunction with the Sun
Oct	01	Th		Venus: 43.6° W

* For the Grand Traverse Region the Moon will rise at 12:10 a.m. occulting Aldebaran.  Aldebaran will appear at the Moon’s unilluminated top right edge at approximately 12:40 a.m.

Note:  All lunar conjunctions in the table above are geocentric.  Double check with a program like Stellarium to check on the position of the body with respect to the moon for your location.

09/01/2014 – Ephemeris – Previewing the month of September

Ephemeris for Labor Day, Monday, September 1st.  The sun will rise at 7:04.  It’ll be up for 13 hours and 14 minutes, setting at 8:19.   The moon, 1 day before first quarter, will set at 12:02 tomorrow morning.

Let’s look at the skies for the month of September. The sun will moving at its greatest speed in its retreat to the south. Daylight hours in the Interlochen/Traverse City area and will drop from 13 hours and 14 minutes today to 11 hours 45 minutes on the 30th. The altitude of the sun above the southern horizon at local noon will be 54 degrees today, and will descend to 42 degrees on the 30th. The season of summer is getting short, so enjoy it while you can. Summer ends and autumn begins at 10:30 p.m. on September 22nd.  Saturn is retreating toward the sun now.  Mars is pushing on eastward.  On the 27th Mars will be north of the star Antares.  It will be a good time to compare their colors.

Times are for the Traverse City/Interlochen area of Michigan.  They may be different for your location.

Addendum

September star chart for 10 p.m. on September 15, 2014. Created by my LookingUp program.

The Moon is not plotted.  The planets are plotted for the 15th.  Mars will move eastward through the month and will approach Saturn.

Astronomical twilight ends at 10:05 p.m. on September 1st, decreasing to 9:01 on the 30th.

Add a half hour to every week before the 15th and subtract and hour for every week after the 15th.

For a list of constellation names to go with the abbreviations click here.

Also shown is the Summer Triangle in red. Clockwise from the top star is Deneb in Cygnus, Vega in  Lyra and Altair in Aquila.

The green pointers from the Big Dipper are:

• Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
• The arc of the dipper’s handle points to Arcturus.

08/30/2012 – Ephemeris – Previewing September skies

Ephemeris for Thursday, August 30th.  The sun will rise at 7:03.  It’ll be up for 13 hours and 18 minutes, setting at 8:21.   The moon, 1 day before full, will set at 7:12 tomorrow morning.

Let’s look ahead at the skies for September a couple of days early. The sun is moving at its greatest speed in its retreat to the south. Daylight hours in the Interlochen/Traverse City area and will drop from 13 hours and 12 minutes Saturday to 11 hours 44 minutes on the 30th. The altitude of the sun above the southern horizon at local noon will be 54 degrees Saturday, and will descend to 42 degrees on the 30th. Folks in the straits area will see the sun a degree lower than that.  The official season of summer is getting short too, so enjoy it while you can.  Summer ends and autumn begins at 10:49 a.m. on September 22nd.  That Harvest Moon will be on the 29th.  Tomorrows full moon will be the rare Blue Moon – More on that tomorrow.

Times are for the Traverse City/Interlochen area of Michigan.  They may be different for your location.