KSDY Sidney-Richland Regional night times
Sidney, MT · FAA SDY
Night of Nov 6 to Nov 7MST
Position lights
§ 91.2094:31 PMto6:50 AM
Sunset to sunrise. Lights on.
2331Z to 1350Z
Night logging
§ 1.15:04 PMto6:18 AM
Civil twilight. Log it as night.
0004Z to 1318Z
Night currency
§ 61.57(b)5:31 PMto5:50 AM
One hour after sunset. Landings count.
0031Z to 1250Z
Evenings at KSDY
When each night begins, through the year. Local time.
| Date | SunsetLights on | Civil twilight endsLog night | 1 hr after sunsetLandings count |
|---|---|---|---|
| Nov 1MST | 4:39 PM | 5:11 PM | 5:39 PM |
| Nov 15MST | 4:20 PM | 4:53 PM | 5:20 PM |
| Dec 1MST | 4:07 PM | 4:42 PM | 5:07 PM |
| Dec 15MST | 4:05 PM | 4:41 PM | 5:05 PM |
| Jan 1MST | 4:15 PM | 4:51 PM | 5:15 PM |
| Jan 15MST | 4:32 PM | 5:07 PM | 5:32 PM |
| Feb 1MST | 4:58 PM | 5:31 PM | 5:58 PM |
| Feb 15MST | 5:20 PM | 5:52 PM | 6:20 PM |
| Mar 1MST | 5:41 PM | 6:12 PM | 6:41 PM |
| Mar 15MDT | 7:02 PM | 7:33 PM | 8:02 PM |
| Apr 1MDT | 7:27 PM | 7:58 PM | 8:27 PM |
| Apr 15MDT | 7:47 PM | 8:19 PM | 8:47 PM |
| May 1MDT | 8:09 PM | 8:44 PM | 9:09 PM |
| May 15MDT | 8:28 PM | 9:05 PM | 9:28 PM |
| Jun 1MDT | 8:47 PM | 9:27 PM | 9:47 PM |
| Jun 15MDT | 8:57 PM | 9:38 PM | 9:57 PM |
| Jul 1MDT | 8:58 PM | 9:39 PM | 9:58 PM |
| Jul 15MDT | 8:51 PM | 9:30 PM | 9:51 PM |
| Aug 1MDT | 8:32 PM | 9:08 PM | 9:32 PM |
| Aug 15MDT | 8:09 PM | 8:43 PM | 9:09 PM |
| Sep 1MDT | 7:37 PM | 8:09 PM | 8:37 PM |
| Sep 15MDT | 7:09 PM | 7:40 PM | 8:09 PM |
| Oct 1MDT | 6:36 PM | 7:07 PM | 7:36 PM |
| Oct 15MDT | 6:09 PM | 6:40 PM | 7:09 PM |
Mornings at KSDY
When each night ends. Local time.
| Date | 1 hr before sunriseLandings stop counting | Civil twilight beginsNight logging ends | SunriseLights off |
|---|---|---|---|
| Nov 1MST | 5:41 AM | 6:09 AM | 6:41 AM |
| Nov 15MST | 6:03 AM | 6:29 AM | 7:03 AM |
| Dec 1MST | 6:25 AM | 6:49 AM | 7:25 AM |
| Dec 15MST | 6:39 AM | 7:03 AM | 7:39 AM |
| Jan 1MST | 6:45 AM | 7:10 AM | 7:45 AM |
| Jan 15MST | 6:41 AM | 7:06 AM | 7:41 AM |
| Feb 1MST | 6:24 AM | 6:51 AM | 7:24 AM |
| Feb 15MST | 6:03 AM | 6:31 AM | 7:03 AM |
| Mar 1MST | 5:38 AM | 6:07 AM | 6:38 AM |
| Mar 15MDT | 6:10 AM | 6:39 AM | 7:10 AM |
| Apr 1MDT | 5:36 AM | 6:04 AM | 6:36 AM |
| Apr 15MDT | 5:08 AM | 5:36 AM | 6:08 AM |
| May 1MDT | 4:40 AM | 5:05 AM | 5:40 AM |
| May 15MDT | 4:19 AM | 4:42 AM | 5:19 AM |
| Jun 1MDT | 4:03 AM | 4:23 AM | 5:03 AM |
| Jun 15MDT | 3:58 AM | 4:17 AM | 4:58 AM |
| Jul 1MDT | 4:03 AM | 4:22 AM | 5:03 AM |
| Jul 15MDT | 4:14 AM | 4:35 AM | 5:14 AM |
| Aug 1MDT | 4:34 AM | 4:58 AM | 5:34 AM |
| Aug 15MDT | 4:52 AM | 5:18 AM | 5:52 AM |
| Sep 1MDT | 5:15 AM | 5:43 AM | 6:15 AM |
| Sep 15MDT | 5:34 AM | 6:03 AM | 6:34 AM |
| Oct 1MDT | 5:56 AM | 6:25 AM | 6:56 AM |
| Oct 15MDT | 6:16 AM | 6:44 AM | 7:16 AM |
Lights and runways
As the FAA lists them. NOTAMs aren't included, so check current NOTAMs before you fly.
ACTVT MIRL RYS 01/19 & 11/29; REIL RYS 01 & 19, 11 & 29; PAPI RYS 01 & 19, 11 & 29 - CTAF.
Runway 01/19
5,705 × 100 ft · Asphalt
Runway 11/29
4,024 × 100 ft · Asphalt
Frequencies
Night at KSDY, in short
When can I log night time at KSDY?
From the end of evening civil twilight to the beginning of morning civil twilight, when the sun is 6° below the horizon (14 CFR 1.1). On the night of Nov 6, 2026, that was 5:04 PM to 6:18 AM MST.
When do landings at KSDY count for night currency?
From one hour after sunset to one hour before sunrise. To carry passengers at night you need 3 takeoffs and 3 full-stop landings in that period within the last 90 days (14 CFR 61.57(b)). On the night of Nov 6, 2026, that was 5:31 PM to 5:50 AM MST.
When are position lights required at KSDY?
From sunset to sunrise (14 CFR 91.209(a)). On the night of Nov 6, 2026, that was 4:31 PM to 6:50 AM MST.
Nearby airports
- 5U6 Fairview Fairview, MT · 11 nm
- S85 Big Sky Field Culbertson, MT · 30 nm
- 7U8 Richey Richey, MT · 36 nm
- KXWA Williston Basin International Williston, ND · 38 nm
- S25 Watford City Municipal Watford City, ND · 38 nm
- KGDV Dawson Community Glendive, MT · 42 nm
Times are worked out from the sun's position for a sea-level horizon, rounded to the minute. Airport data from the FAA NASR cycle of Oct 29, 2026.