Bob Moler's Ephemeris Blog

Ephemeris for Tuesday, January 31st.  The sun will rise at 8:02.  It’ll be up for 9 hours and 46 minutes, setting at 5:49.   The moon, 1 day past first quarter, will set at 2:50 tomorrow morning.

Let’s preview the month of February.  It will be a day longer this year because it’s a leap year, the adjustment to keep the calendar in sync with the seasons.  The daylight hours throughout February will be getting longer.  Daylight hours will increase from 9 hours and 48 minutes tomorrow to 11 hours and 8 minutes on the 29th.  The altitude of the sun at noon will increase from 28 degrees tomorrow to nearly 38 degrees at month’s end.  The straits area will see the sun a degree lower.  Local noon, by the way for Interlochen and Traverse City is about 12:55 p.m, which is mainly due to the fact that our standard time meridian happens to run through Philadelphia and the sun is currently running 12 minutes slow.

* Times, as always are for the Traverse City/Interlochen area of  Michigan.

Addendum

Sunrise planets at 5 day intervals for February 2012

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Sunset planets at 5 day intervals for February 2012

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