Chelmsford, Massachusetts
Sunrise and sunset in Chelmsford, Massachusetts
Today’s sunrise, sunset and twilight in Chelmsford, Massachusetts, in local time. At 42.6° N, the day lasts from 9 h 03 min at the winter solstice to 15 h 19 min at the summer solstice.
Today · worked out at
Thursday, October 22: sunrise at 07:06, sunset at 17:52.
Day length 10 h 45 min, 2 min 43 s shorter than yesterday.
Solar noon at 12:29, with the Sun 36° above the horizon.
Times are Chelmsford, Massachusetts time (EDT).
Twilight and golden hour today
| Today | Morning | Evening |
|---|---|---|
| Astronomical twilight | 05:32 | 19:26 |
| Nautical twilight | 06:05 | 18:53 |
| Civil twilight | 06:38 | 18:20 |
| Sunrise and sunset | 07:06 | 17:52 |
| Golden hour | 07:06–07:46 | 17:13–17:52 |
Each twilight begins at the morning time and ends at the evening one.
The year in Chelmsford, Massachusetts
- Longest day: June 21, 15 h 19 min, from sunrise at 05:07 to sunset at 20:26.
- Shortest day: December 21, 9 h 03 min, from sunrise at 07:12 to sunset at 16:15.
Sunrise and sunset on the 21st of each month, 2026
| Date | Sunrise | Sunset | Day length |
|---|---|---|---|
| January 21 | 07:09 | 16:44 | 9 h 36 min |
| February 21 | 06:33 | 17:25 | 10 h 52 min |
| March 21 | 06:46 | 18:58 | 12 h 12 min |
| April 21 | 05:54 | 19:34 | 13 h 40 min |
| May 21 | 05:17 | 20:07 | 14 h 49 min |
| June 21 | 05:07 | 20:26 | 15 h 19 min |
| July 21 | 05:26 | 20:16 | 14 h 50 min |
| August 21 | 05:58 | 19:37 | 13 h 39 min |
| September 21 | 06:31 | 18:44 | 12 h 13 min |
| October 21 | 07:05 | 17:53 | 10 h 48 min |
| November 21 | 06:44 | 16:18 | 9 h 34 min |
| December 21 | 07:12 | 16:15 | 9 h 03 min |
Good to know
- Sunrise and sunset are when the top of the Sun meets a level horizon, allowing for the usual bending of light by the air. Hills, buildings and height shift what you see by a few minutes.
- Civil, nautical and astronomical twilight end when the Sun is 6°, 12° and 18° below the horizon. Golden hour here is the photographers’ usual definition: the Sun less than 6° above it.
- Worked out when the page loads from NOAA’s solar equations, for 42.6° N, 71.4° W, and accurate to about a minute.
How the layers work, where their data comes from and what they can’t tell you: Day and night, live, The Sun, Moon and planets
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