Home > Calendar, Concepts, Ephemeris Program > 03/14/2022 – Ephemeris – It’s Pi Day!

03/14/2022 – Ephemeris – It’s Pi Day!

March 14, 2022

This is Ephemeris for Pi Day, Monday, March 14th. Today the Sun will be up for 11 hours and 50 minutes, setting at 7:47, and it will rise tomorrow at 7:55. The Moon, 4 days before full, will set at 7:10 tomorrow morning.

Mathematicians and scientists, both professional and amateur, celebrate Pi day to bake and eat pies. Actually, the Pi we’re talking about is the Greek letter π that signifies the ratio of the circumference of a circle to its diameter. March 14th can be written 3.14, π to two decimal places. Of course, if you wait until 4 pm to have your pie, you can have π to 4 decimal places, since 4 pm is the 16th hour of the day in military time. This gives 3.1416. The digits go on forever, never repeating a pattern. Some mathematicians prefer Tau Day, June 28th or 2 times π which is the more useful mathematical ratio of the circumference of a circle to its radius, which is 6.28 or 6.2832. However you slice it, π is a very useful number.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT – 4 hours). They may be different for your location.


Have a slice of Pi Day pie

Here’s a link to NASA’s Pi Day Challenge: https://www.jpl.nasa.gov/edu/nasapidaychallenge/. The link also has a link for educators for STEM related challenges.

Since recording this program, I learned about another Pi day some celebrate. A well-known approximation of pi is the fraction 22/7ths. Europeans and others write dates in day/month order, so July 22nd is also a Pi Day: 22/7.

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