01/05/2017 – Ephemeris – About Ephemeris rise and set times, an annual confession
Thursday, January 5th. The Sun will rise at 8:19. It’ll be up for 8 hours and 58 minutes, setting at 5:17. The Moon, at first quarter today, will set at 1:23 tomorrow morning.
Lets talk about the Ephemeris program itself. The format has changed little in the 41 ½ years it’s been on the air. The problem with talking about rising and setting phenomenon is that back when I started IPR has only one transmitter and that was next to the studio Now it has transmitters covering just about all of the northwestern part of the Lower Peninsula of Michigan. So your rise and set time can be quite different. On my Ephemeris website I have the times listed for the year for several locations in the IPR listening area under calendars. On any search engine search for Bob Moler Ephemeris. The Ephemeris Blog ( you’re already here) contains transcripts of the programs with illustrations and more in depth explanations.
Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
The red arrow points to the calendars for some locations, The green arrows point to program mp3s for the current week. The blue arrows point to links to this blog.
Calendars currently available:
Interlochen/Traverse City (Source for the times on the Ephemeris program)
Eagle Harbor – Keweenaw Peninsula
Earth’s Equator at the Prime Meridian (Just for fun. See how the daylight hours stay pretty much at 12 hours)