This is the companion Web Site of Bob Moler's Ephemeris radio program, which is broadcast Monday Through Friday on Interlochen Public Radio Stations. Interlochen Public Radio serves northwestern lower Michigan. The first Ephemeris program was broadcast June 1, 1975.

Click on the above link for live streaming audio from IPR. Or download the Interlochen Public Radio app from the Apple App Store or Google Play.

Bob Moler's Ephemeris Blog contains scripts and illustrations for the Ephemeris programs. They are generally released at 12:01 a.m. Eastern Time on the program play date.

NASA/JPL Solar System Ambassador


Contact me at the email address at the bottom of this page to discuss star parties and presentations for schools, scout groups, and non-profit organizations in person or via Zoom.


That being said, opinions expressed on this website are my own and not that of NASA or JPL

Ephemeris Radio Schedule Monday - Friday

Ephemeris air times (ET)

6:19 & 8:19 a.m. - News stations

7 a.m.- Classical stations

The Stations of Interlochen Public Radio


WIAA 88.7 FM Caberfae

W234BU 94.7 FM Traverse City

WIAB 88.5 FM Mackinaw City


WICA 91.5, FM Traverse City

WLNM 89.7 FM Manistee, Ludington

WHBP 90.1 FM Harbor Springs, Petoskey

Note that scripts for the programs plus illustrations and additional information are part of my Ephemeris blog, which can be clicked on above.

Observing Weather in Northwestern Lower Michigan

Clear Sky Chart from Attilla Danko
NWS Traverse City Forecast.
Gaylord, MI Weather Radar.
Canadian based Infrared Satellite (GOES-East data) Michigan shows best in the Eastern Canada view
GOES-East - Sector Views: Great Lakes - GeoColor

On this site* – articles of interest for this month

Beginner's Guide to the Moon

* Newer articles and revised old ones will be moved to my blogsite, though they can be accessed here.

January 2023

Interested in learning more about astronomy or the night sky? If you live in northwestern lower Michigan check out the Grand Traverse Astronomical Society.

More information on visible planetary and other events are available on Bob Moler's Ephemeris Blog the day of the event. The blog contains Monday-Friday program scripts, most with illustrations and additional information.

I dug through the IPR web archives and found these:

Bob Moler looks back at 40 years of 'Ephemeris'

I’m interviewed about all things astronomical prior to the August 21, 2017 eclipse. Photo, text, and audio.


Extra! My report on the Great American Eclipse of August 21, 2017, with added animated GIF of the sky at the totally eclipsed Sun, watching the shadow pass over.

Planetary Highlights for January 2023 (ET)

    Date      Time    Event
Jan  1  Su            Venus: 17.3° E
     1  Su  10:25 am  Moon Ascending Node
     2  Mo   8:24 pm  Moon-Pleiades: 2.8° N
     3  Tu   2:35 pm  Moon-Mars:  0.6° N
     3  Tu  10:06 pm  Quadrantid Shower: ZHR = 120
     4  We   2:59 pm  Perihelion:  0.9833 AU
     5  Th  10:08 pm  Moon North Dec.: 27.4° N
     6  Fr   6:08 pm  Full Wolf Moon
     7  Sa   7:53 am  Mercury Inferior Conj.
     7  Sa   8:40 am  Moon-Pollux: 2.1° N
     8  Su   4:19 am  Moon Apogee: 406,500 km
     8  Su  10:23 am  Moon-Beehive: 4° S
    14  Sa   9:10 pm  Last Quarter
    16  Mo   1:32 am  Moon Descending Node
    18  We   4:32 am  Moon-Antares: 2.1° S
    20  Fr  12:06 am  Moon South Dec.: 27.5° S
    21  Sa   3:53 pm  New Moon
    21  Sa   3:58 pm  Moon Perigee: 356,600 km
    22  Su   4:53 pm  Venus-Saturn:  0.3° N
    23  Mo   2:22 am  Moon-Saturn: 3.8° N
    23  Mo   3:20 am  Moon-Venus: 3.4° N
    25  We   9:00 pm  Moon-Jupiter: 1.8° N
    28  Sa  10:19 am  First Quarter
    28  Sa  11:05 am  Moon Ascending Node
    30  Mo  12:59 am  Mercury Elongation: 25° W
    30  Mo   2:21 am  Moon-Pleiades: 2.6° N
    30  Mo  11:24 pm  Moon-Mars:  0.1° N
Feb  1  We            Venus: 24.4° E

Event times are given for Eastern Standard Time, UTC-5 hr.

Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),

If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.

Note that the site is now kept up for archival purposes. Fred Espenak retired from NASA several years ago and has his own site, AstroPixels, which contain much the same information: However, he doesn’t adjust for Daylight Saving Time.

Free Software

Stellarium is a fabulous planetarium program with a very realistic sky and simple controls.

They've added some features in the latest version (1.0!) and new rendering engine that may not be compatible with older computers without using command line options. See the Stellarium User Guide (pdf) under Command Line Options for what to try. Finally, after 20 years, it’s out of Beta testing.

There’s a web based version of Stellarium. It’s pretty much bare bones, but works much like the computer version. It’s located here: There is also a smart phone and tablet version both free and $.

Cartes du Ciel (Sky Charts) is a great telescope companion. I use it to create finder charts for comets and calendar lists of twilight times for the monthly preview on my blog. I use it for my weekly look at the planet telescopic appearances. It can be downloaded from

Virtual Moon Atlas is a great tool for reference at the telescope or desk.

Celestia is a great 3D simulator of solar system objects and beyond. However it has not been updated in a while.

Hallo Northern Sky is an interesting planetarium program. It seems not as polished as Stellarium, but has some cool features. I use it when planning star parties as a quick way to see what would be visible because it loads quickly.

Years on the air: 47 (Since June 1975)

Years on the Internet: 27 (Since September 1995)


Updated: 12/31/22