Star Calendar – January 2017 | Star Calendar
Star Calendar January 2017 Star Calendar Planets: Moon waxes from the westward side and wanes on the eastward but Venus (and Mercury) do so in the opposite way. Mercury is stationary to the stars on the 8th but the Sun's persistent eastwards motion continues to widen their separation (elongation) until the 19th. On that day astronomical twilight ends at 6:15AM with Mercury just 5 degrees above the horizon, down and to the left of Saturn (12 degrees, SW and less bright) and Antares (15 degrees, slightly S of SW, still less bright). The Moon visits these three in reverse sequence on 23, 24, 25th. Venus makes her flourish for this appearance during this month as she continues to appear higher each evening, to brighten and to… wane(!) in phase. Venus' phases appear the opposite way from the Moon's and, because she gets markedly nearer in the smaller phases, is brightest when less than gibbous. In her cycle, Venus' apparent diameter expands and contracts 7-fold. Sun is almost 4% nearer in