← 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. |
|---|---|---|---|---|---|---|---|---|
| 2039-04-19 Tue | 0 | — | unknown | — | 89.6° 12:15 | 7.07 | 12% | 52.3° |
| 2039-04-20 Wed | 0 | — | unknown | — | 89.5° 12:15 | 7.01 | 6% | 45.1° |
| 2039-04-21 Thu | 0 | — | unknown | — | 89.7° 12:10 | 6.95 | 2% | 39.9° |
| 2039-04-22 Fri | 0 | — | unknown | — | 89.8° 12:05 | 6.9 | 0% | 37.6° |
| 2039-04-23 Sat | 0 | — | unknown | — | 89.7° 12:00 | 6.84 | 0% | 38.5° |
| 2039-04-24 Sun | 0 | — | unknown | — | 89.6° 11:55 | 6.78 | 2% | 42.3° |
| 2039-04-25 Mon | 0 | — | unknown | — | 89.7° 11:50 | 6.72 | 6% | 48.4° |
| 2039-04-26 Tue | 0 | — | unknown | — | 89.8° 11:45 | 6.66 | 11% | 55.8° |
| 2039-04-27 Wed | 1 | — | unknown | — | 89.7° 11:40 | 6.6 | 17% | 64.2° |
| 2039-04-28 Thu | 1 | — | unknown | — | 89.5° 11:35 | 6.55 | 25% | 73.2° |
| 2039-04-29 Fri | 1 | — | unknown | — | 89.6° 11:35 | 6.49 | 34% | 82.6° |
| 2039-04-30 Sat | 1 | — | unknown | — | 89.8° 11:30 | 6.43 | 43% | 92.3° |
| 2039-05-01 Sun | 1 | — | unknown | — | 89.8° 11:25 | 6.37 | 53% | 102.2° |
| 2039-05-02 Mon | 1 | — | unknown | — | 89.6° 11:20 | 6.31 | 64% | 112.1° |
| 2039-05-03 Tue | 1 | — | unknown | — | 89.5° 11:20 | 6.26 | 74% | 121.8° |
| 2039-05-04 Wed | 1 | — | unknown | — | 89.7° 11:15 | 6.2 | 83% | 130.8° |
| 2039-05-05 Thu | 1 | — | unknown | — | 89.8° 11:10 | 6.14 | 91% | 138.1° |
| 2039-05-06 Fri | 1 | — | unknown | — | 89.7° 11:05 | 6.08 | 96% | 142.1° |
| 2039-05-07 Sat | 2 | — | unknown | — | 89.6° 11:00 | 6.03 | 100% | 141.5° |
| 2039-05-08 Sun | 2 | — | unknown | — | 89.6° 11:00 | 5.97 | 100% | 136.2° |
| 2039-05-09 Mon | 2 | — | unknown | — | 89.7° 10:55 | 5.91 | 97% | 127.6° |
| 2039-05-10 Tue | 2 | — | unknown | — | 89.8° 10:50 | 5.86 | 91% | 117.2° |
| 2039-05-11 Wed | 2 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.7° 10:45 | 5.8 | 83% | 106.1° |
| 2039-05-12 Thu | 2 | — | unknown | 04:05–04:10 (marginal, 0.08 h) | 89.5° 10:40 | 5.75 | 74% | 94.8° |
| 2039-05-13 Fri | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.6° 10:40 | 5.69 | 63% | 83.8° |
| 2039-05-14 Sat | 3 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.8° 10:35 | 5.64 | 52% | 73.2° |
| 2039-05-15 Sun | 3 | — | unknown | 03:55–04:05 (marginal, 0.17 h) | 89.8° 10:30 | 5.59 | 42% | 63.3° |
| 2039-05-16 Mon | 4 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.7° 10:25 | 5.53 | 32% | 54.3° |
| 2039-05-17 Tue | 6 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.5° 10:25 | 5.48 | 23% | 46.7° |
| 2039-05-18 Wed | 7 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 89.7° 10:20 | 5.43 | 15% | 41.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2039-04-19&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.