← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-05-16 Sun | 0 | — | unknown | — | 79.1° 11:15 | 5.54 | 87% | 155.4° |
| 2027-05-17 Mon | 0 | — | unknown | — | 79.1° 11:15 | 5.48 | 93% | 164.0° |
| 2027-05-18 Tue | 0 | — | unknown | — | 79.1° 11:10 | 5.43 | 97% | 164.3° |
| 2027-05-19 Wed | 0 | — | unknown | — | 79.1° 11:05 | 5.38 | 100% | 156.3° |
| 2027-05-20 Thu | 0 | — | unknown | — | 79.1° 11:00 | 5.33 | 100% | 145.6° |
| 2027-05-21 Fri | 0 | — | unknown | — | 79.1° 11:00 | 5.28 | 98% | 134.2° |
| 2027-05-22 Sat | 0 | — | unknown | — | 79.1° 10:55 | 5.23 | 94% | 122.7° |
| 2027-05-23 Sun | 0 | — | unknown | — | 79.1° 10:50 | 5.19 | 89% | 111.1° |
| 2027-05-24 Mon | 0 | — | unknown | — | 79.1° 10:45 | 5.14 | 82% | 99.6° |
| 2027-05-25 Tue | 0 | — | unknown | — | 79.1° 10:40 | 5.09 | 74% | 88.1° |
| 2027-05-26 Wed | 0 | — | unknown | — | 79.1° 10:40 | 5.05 | 66% | 76.6° |
| 2027-05-27 Thu | 0 | — | unknown | — | 79.1° 10:35 | 5.0 | 56% | 65.1° |
| 2027-05-28 Fri | 0 | — | unknown | — | 79.1° 10:30 | 4.96 | 47% | 53.6° |
| 2027-05-29 Sat | 0 | — | unknown | — | 79.1° 10:25 | 4.92 | 37% | 42.0° |
| 2027-05-30 Sun | 0 | — | unknown | — | 79.1° 10:20 | 4.88 | 27% | 30.5° |
| 2027-05-31 Mon | 1 | — | unknown | — | 79.1° 10:20 | 4.84 | 19% | 20.1° |
| 2027-06-01 Tue | 1 | — | unknown | — | 79.1° 10:15 | 4.8 | 11% | 14.4° |
| 2027-06-02 Wed | 1 | — | unknown | — | 79.1° 10:10 | 4.77 | 5% | 19.4° |
| 2027-06-03 Thu | 1 | — | unknown | — | 79.1° 10:05 | 4.73 | 1% | 30.7° |
| 2027-06-04 Fri | 1 | — | unknown | — | 79.1° 10:00 | 4.7 | 0% | 43.9° |
| 2027-06-05 Sat | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.1° 10:00 | 4.67 | 2% | 58.0° |
| 2027-06-06 Sun | 2 | — | unknown | 04:25–04:35 (marginal, 0.17 h) | 79.1° 09:55 | 4.64 | 6% | 72.3° |
| 2027-06-07 Mon | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.1° 09:50 | 4.61 | 14% | 86.6° |
| 2027-06-08 Tue | 2 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.1° 09:45 | 4.59 | 23% | 100.8° |
| 2027-06-09 Wed | 3 | — | unknown | 04:15–04:30 (marginal, 0.25 h) | 79.1° 09:45 | 4.56 | 33% | 114.7° |
| 2027-06-10 Thu | 3 | — | unknown | 04:10–04:30 (marginal, 0.33 h) | 79.1° 09:40 | 4.54 | 44% | 128.2° |
| 2027-06-11 Fri | 3 | — | unknown | 04:10–04:30 (marginal, 0.33 h) | 79.1° 09:35 | 4.52 | 55% | 141.1° |
| 2027-06-12 Sat | 4 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.1° 09:30 | 4.5 | 66% | 153.0° |
| 2027-06-13 Sun | 5 | — | unknown | 04:00–04:30 (marginal, 0.5 h) | 79.1° 09:25 | 4.48 | 76% | 162.6° |
| 2027-06-14 Mon | 6 | — | unknown | 03:55–04:30 (marginal, 0.58 h) | 79.1° 09:25 | 4.47 | 84% | 165.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-05-16&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.