Star Calendar – January 2015

Star Calendar

January 2015

Star Calendar Planets:

Moon follows a sinus path tipped 5 degrees to the ecliptic, which is itself tipped 23 ½ degrees to the celestial equator. The phase of these two tipping curves slowly changes, a cycle of phase-shift taking 18.6 years. When the Moon and Sun’s (vernal) ascending nodes coincide (additive phase relationship) the Moon soars above, and plunges below, the equator with a declination range of 57 degrees – as in 2005-6. This year, some 9 years later, the curves instead subtract and we have a minimum range of declination for the Moon; being just 36-37 degrees (compared to the Sun’s steady 47 degrees). This is also referred to as a “minor lunar standstill”. Moon’s descending node will correspond with vernal equinox in March this year. For 2015, the very highest declination the Moon will achieve will be only 18 2/3 degree; on Jan 3rd.

Mercury sweeps up to meet Venus on the 11th and may be looked for in the early evenings of the following week with reasonable expectation if one has a good horizon in the WSW. Already by the 21st Mercury will be hard to find despite a helpful but very thin, young Moon nearby. February’s morning apparition will be poor but May’s will be the best for the year.

Venus continues her magnificent evening ascent at a stately pace. She will be an evening feature until June.

Sun is nearest earth on the 3rd and its disk is actually larger. Total solar eclipses are rarer in January; more common in July when more distant/smaller. The Sun also progresses faster against the backdrop of stars at this time of year.

Mars has a year 684 Earth-days long (or 668 Mars-days) during which it also has seasons. Martian solstice occurs on our Jan 11th, with the Martian North turned away from the Sun. Oddly the northern Martian winter is longer than the southern – as interpreted by the outbreak of reflective frost and dry ice at the respective poles. Martian seasons are more dramatically modified by their relationship to its apsides (proximity to the Sun) than Earth’s.

Jupiter is moving retrograde, approaching its maximum brightness for an opposition in Cancer early next month.

Saturn continues to dominate the SE before sunrise. The Moon will again pass very near on the 16th.

Star Calendar Days:

1      Sunrise/sunset in Spring Valley at 7:21/16:38 EST (9h17m daylight)

          Anno Domine 2015 begins; the reformed Roman/Gregorian calendar

2      Moon above Betelgeuse/Orion in east as dusk sets in, around 5:30PM

3      Moon makes highest path, rises furthest north, for the year

          Sun nearest Earth for the year, “perihelion”

4      Full Wolf Moon at 11:53PM

5      Latest Sunrise for the year, 7:22EST in Spring Valley

7      Christmas on Roman/Julian Dec. 25, 2767 A.U.C.

          Moon rises beside Jupiter in east after 8:PM

11      Venus and Mercury conjunct in low WSW around 5:45PM

          Solstice on Mars, winter for northern hemisphere

13      Moon above Spica in south 6:-6:30AM

14      Mercury at largest angle from Sun for this appearance

          2768 ab urbe condita (since founding of Rome) begins east-orthodox year

16      Moon very near Saturn, above Antares, SE 5:30-6:30AM

18      Moon makes lowest path, rises furthest south, for the year

20      Mercury stationary to retrograde

21      Young Moon above Mercury, beside Venus, WSW 5:45PM difficult

22      Moon beside Mars, above Venus, WSW 5:45-6:30 PM prominent

24      Moon rises on vernal equinox, due east, 9:45 AM

25      Moon crosses ecliptic southward (descending node)

29      Moon beside Aldebaran in SE at 7:PM

30      Mercury crosses nearside of Sun (inferior conjunction)

31      Sunrise/sunset in Spring Valley at 7:02/17:12 EST (10h10m daylight)

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About pbdavis

Paul Davis is a former resident of the Threefold Community. He has been a teacher of Celestial Navigation, a Planetarium lecturer, and offered evening Astronomy classes at Sunbridge some years ago. He is now living in New Hampshire.