← 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. |
|---|---|---|---|---|---|---|---|---|
| 2038-04-20 Tue | 0 | — | unknown | — | 89.6° 12:10 | 7.0 | 96% | 136.2° |
| 2038-04-21 Wed | 0 | — | unknown | — | 89.5° 12:10 | 6.94 | 91% | 128.2° |
| 2038-04-22 Thu | 0 | — | unknown | — | 89.8° 12:00 | 6.88 | 83% | 118.5° |
| 2038-04-23 Fri | 0 | — | unknown | — | 89.8° 12:00 | 6.82 | 74% | 108.2° |
| 2038-04-24 Sat | 0 | — | unknown | — | 89.6° 11:50 | 6.77 | 64% | 97.8° |
| 2038-04-25 Sun | 0 | — | unknown | — | 89.6° 11:50 | 6.71 | 53% | 87.5° |
| 2038-04-26 Mon | 0 | — | unknown | — | 89.7° 11:45 | 6.65 | 43% | 77.6° |
| 2038-04-27 Tue | 1 | — | unknown | — | 89.8° 11:40 | 6.59 | 34% | 68.2° |
| 2038-04-28 Wed | 1 | — | unknown | — | 89.7° 11:35 | 6.53 | 25% | 59.4° |
| 2038-04-29 Thu | 1 | — | unknown | — | 89.5° 11:30 | 6.47 | 17% | 51.6° |
| 2038-04-30 Fri | 1 | — | unknown | — | 89.6° 11:30 | 6.42 | 11% | 45.0° |
| 2038-05-01 Sat | 1 | — | unknown | — | 89.8° 11:25 | 6.36 | 6% | 40.3° |
| 2038-05-02 Sun | 1 | — | unknown | — | 89.8° 11:20 | 6.3 | 2% | 38.3° |
| 2038-05-03 Mon | 1 | — | unknown | — | 89.6° 11:15 | 6.24 | 0% | 39.2° |
| 2038-05-04 Tue | 1 | — | unknown | — | 89.5° 11:15 | 6.19 | 0% | 43.0° |
| 2038-05-05 Wed | 2 | — | unknown | — | 89.7° 11:10 | 6.13 | 2% | 49.0° |
| 2038-05-06 Thu | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.8° 11:05 | 6.07 | 6% | 56.7° |
| 2038-05-07 Fri | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.7° 11:00 | 6.01 | 11% | 65.3° |
| 2038-05-08 Sat | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.6° 10:55 | 5.96 | 18% | 74.7° |
| 2038-05-09 Sun | 2 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.6° 10:55 | 5.9 | 27% | 84.6° |
| 2038-05-10 Mon | 3 | — | unknown | 04:45–05:00 (marginal, 0.25 h) | 89.7° 10:50 | 5.85 | 37% | 94.8° |
| 2038-05-11 Tue | 3 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.8° 10:45 | 5.79 | 47% | 105.1° |
| 2038-05-12 Wed | 3 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.7° 10:40 | 5.73 | 58% | 115.3° |
| 2038-05-13 Thu | 4 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.5° 10:35 | 5.68 | 69% | 125.1° |
| 2038-05-14 Fri | 4 | — | unknown | 04:30–04:55 (marginal, 0.42 h) | 89.6° 10:35 | 5.63 | 79% | 133.6° |
| 2038-05-15 Sat | 4 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.8° 10:30 | 5.57 | 88% | 139.7° |
| 2038-05-16 Sun | 4 | — | unknown | 04:30–04:50 (marginal, 0.33 h) | 89.8° 10:25 | 5.52 | 95% | 141.7° |
| 2038-05-17 Mon | 5 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.6° 10:20 | 5.47 | 99% | 138.9° |
| 2038-05-18 Tue | 5 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 89.5° 10:20 | 5.42 | 100% | 132.2° |
| 2038-05-19 Wed | 6 | — | unknown | 03:35–04:00 (marginal, 0.42 h) | 89.7° 10:15 | 5.37 | 98% | 123.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2038-04-20&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.