← single night · whole-night plan
Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.
| night of | astronomy | weather | overall | best window | highest | dark h | Moon | Moon sep. |
|---|---|---|---|---|---|---|---|---|
| 2027-08-22 Sun | 0 | — | unknown | — | 42.9° 08:50 | 7.03 | 72% | 58.7° |
| 2027-08-23 Mon | 1 | — | unknown | — | 42.9° 08:50 | 7.09 | 62% | 49.1° |
| 2027-08-24 Tue | 1 | — | unknown | — | 42.9° 08:45 | 7.15 | 52% | 40.6° |
| 2027-08-25 Wed | 2 | — | unknown | — | 42.9° 08:40 | 7.2 | 41% | 34.5° |
| 2027-08-26 Thu | 3 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.26 | 30% | 32.6° |
| 2027-08-27 Fri | 4 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.32 | 20% | 36.0° |
| 2027-08-28 Sat | 5 | — | unknown | 04:45–05:05 (marginal, 0.33 h) | 42.9° 08:30 | 7.37 | 11% | 43.7° |
| 2027-08-29 Sun | 7 | — | unknown | 04:40–05:45 (marginal, 1.08 h) | 42.9° 08:25 | 7.43 | 5% | 54.1° |
| 2027-08-30 Mon | 9 | — | unknown | 05:05–05:10 (good, 0.08 h) | 42.9° 08:20 | 7.49 | 1% | 65.9° |
| 2027-08-31 Tue | 10 | — | unknown | 05:05–05:10 (good, 0.08 h) | 42.9° 08:15 | 7.54 | 0% | 78.3° |
| 2027-09-01 Wed | 11 | — | unknown | 05:00–05:10 (good, 0.17 h) | 42.9° 08:15 | 7.6 | 2% | 90.8° |
| 2027-09-02 Thu | 14 | — | unknown | 04:55–05:15 (good, 0.33 h) | 42.9° 08:10 | 7.65 | 7% | 103.0° |
| 2027-09-03 Fri | 15 | — | unknown | 04:50–05:15 (good, 0.42 h) | 42.9° 08:05 | 7.71 | 14% | 114.6° |
| 2027-09-04 Sat | 17 | — | unknown | 04:45–05:15 (good, 0.5 h) | 42.9° 08:00 | 7.76 | 22% | 125.3° |
| 2027-09-05 Sun | 18 | — | unknown | 04:45–05:15 (good, 0.5 h) | 42.9° 07:55 | 7.82 | 32% | 134.7° |
| 2027-09-06 Mon | 21 | — | unknown | 04:40–05:20 (good, 0.67 h) | 42.9° 07:55 | 7.87 | 42% | 142.1° |
| 2027-09-07 Tue | 22 | — | unknown | 04:35–05:20 (good, 0.75 h) | 42.9° 07:50 | 7.93 | 52% | 146.6° |
| 2027-09-08 Wed | 24 | — | unknown | 04:30–05:20 (good, 0.83 h) | 42.9° 07:45 | 7.98 | 61% | 147.3° |
| 2027-09-09 Thu | 25 | — | unknown | 04:30–05:20 (good, 0.83 h) | 42.9° 07:40 | 8.04 | 70% | 144.3° |
| 2027-09-10 Fri | 27 | — | unknown | 04:25–05:25 (good, 1.0 h) | 42.9° 07:40 | 8.09 | 79% | 138.3° |
| 2027-09-11 Sat | 29 | — | unknown | 04:20–05:25 (good, 1.08 h) | 42.9° 07:35 | 8.15 | 86% | 130.6° |
| 2027-09-12 Sun | 30 | — | unknown | 04:15–05:25 (good, 1.17 h) | 42.9° 07:30 | 8.2 | 92% | 121.8° |
| 2027-09-13 Mon | 29 | — | unknown | 04:25–05:25 (good, 1.0 h) | 42.9° 07:25 | 8.25 | 96% | 112.3° |
| 2027-09-14 Tue | 23 | — | unknown | 04:30–05:30 (good, 1.0 h) | 42.9° 07:20 | 8.31 | 99% | 102.3° |
| 2027-09-15 Wed | 20 | — | unknown | 04:50–05:30 (good, 0.67 h) | 42.9° 07:20 | 8.36 | 100% | 92.1° |
| 2027-09-16 Thu | 16 | — | unknown | 03:40–05:30 (marginal, 1.83 h) | 42.9° 07:15 | 8.41 | 99% | 81.7° |
| 2027-09-17 Fri | 13 | — | unknown | 03:45–05:30 (marginal, 1.75 h) | 42.9° 07:10 | 8.46 | 96% | 71.3° |
| 2027-09-18 Sat | 11 | — | unknown | 03:50–05:35 (marginal, 1.75 h) | 42.9° 07:05 | 8.52 | 91% | 61.0° |
| 2027-09-19 Sun | 10 | — | unknown | 03:55–05:35 (marginal, 1.67 h) | 42.9° 07:00 | 8.57 | 84% | 51.2° |
| 2027-09-20 Mon | 10 | — | unknown | 03:50–05:35 (marginal, 1.75 h) | 42.9° 07:00 | 8.62 | 76% | 42.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-08-22&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csvOne row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.