Archive for January 22, 2016

01/22/2016 – Ephemeris – Getting sunrise and sunset times for your location

January 22, 2016 Comments off

Ephemeris for Friday, January 22nd.  The Sun will rise at 8:12.  It’ll be up for 9 hours and 24 minutes, setting at 5:36.   The Moon, 1 day before full, will set at 7:31 tomorrow morning.

With the bright moon, blocking all but the brightest stars, it’s a good time to do some housekeeping.    When I started this program 40 ½ years ago Interlochen Public Radio (IPR) had only one transmitter and a single antenna pattern. It was simply WIAA then.  The sunrise and sunset times worked well for that.  However since then with transmitters from Manistee to the Straits I cannot hope to cover it all with a single set of times.  The differences in the times also vary with the seasons.  To get help on the Internet go to my monthly site and click on Calendars.  There are calendars for Ludington, Cadillac, Interlochen/Traverse City, Petoskey and Mackinaw City.  Select a month to view or printout a whole year, or use the email link to request a sunrise, sunset, and Moon calendar for your town.  There’s also a link to get sunrise and sunset times for anywhere in the world

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


As an aside.  I wrote the program to compute the calendars back in the ’80s.  It produces calendars in three formats, of which I still use two: comma separated values, and HTML.  The HTML output is what is used for the calendar pages.  The comma separated value files are input into a database which is used to create for me the first paragraph of the transcript.  For the blog posting I omit “This is Bob Moler with…” as redundant.  The program also produces database tables of the planets from which I base the Wednesday planet program rise, set and sometimes transit times.

The actual Ephemeris audio programs are also found on the under the audio link.  A whole week of programs are available.