Moon phase calendar 2027 for Chicago

Every new moon, first quarter, full moon and last quarter of 2027 in Chicago local time, with moonrise on each full moon day and a calendar for every month.

When are the full moons in Chicago in 2027?

Chicago has 12 full moons in 2027: January 22, February 20, March 22, April 20, May 20, June 18, July 18, August 17, September 15, October 15, November 13 and December 13. All are dated on Central Time, CST or CDT.

Full moons in Chicago, 2027

Each date opens that minute in the moon phase calculator, as seen from Chicago.

Moon phase calendar by month, 2027

Every phase of 2027 in Chicago

One row per lunation, from its new moon to its last quarter, on Central Time.

Clock changes in 2027

Every time on this page is on the clock in force at that instant: CST (Central Standard Time, UTC−6) or CDT (Central Daylight Time, UTC−5). In 2027 the clocks change on these dates:

• Sunday, March 14, at 2:00 a.m. CST, clocks go forward an hour to 3:00 a.m. CDT.
• Sunday, November 7, at 2:00 a.m. CDT, clocks go back an hour to 1:00 a.m. CST.

How the dates are worked out

A phase happens at one instant for the whole Earth, so the date it falls on depends on the clock. The full moon at 00:44 UT on June 19 is at 7:44 p.m. CDT on June 18 in Chicago.

The instants are worked out with the method in chapter 49 of Jean Meeus’s Astronomical Algorithms (1998), the model behind the moon phase calculator, and rounded to the minute as almanacs print them. Every 2026 time is within a minute of the US Naval Observatory’s, and every 2027 time matches NASA’s table of lunar phases by Fred Espenak to the minute.

A day takes a phase’s name when the phase falls on it, at any hour, which is how the US Naval Observatory names days. Any other day is a waxing or waning crescent, under half lit, or gibbous, over half lit. Each disc shows the Moon at 9:00 p.m. in Chicago, turned as it hangs in the sky there.

Moonrise is the moment the top of the Moon clears the horizon, allowing 34 arcminutes for refraction, the US Naval Observatory’s definition. It is worked out for 41.85° N, 87.65° W, the point the time zone database gives for Chicago.

The moon phase calculator shows the Moon on any date from 1900 to 2100, from anywhere, and can lay out the whole of 2027 for Chicago as a picture to save.