← 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. |
|---|---|---|---|---|---|---|---|---|
| 2038-05-17 Mon | 47 | — | unknown | 02:10–04:05 (good, 1.92 h) | 71.1° 05:40 | 5.47 | 99% | 82.3° |
| 2038-05-18 Tue | 39 | — | unknown | 03:00–04:00 (good, 1.0 h) | 71.1° 05:35 | 5.42 | 100% | 71.8° |
| 2038-05-19 Wed | 35 | — | unknown | 03:40–04:00 (good, 0.33 h) | 71.1° 05:30 | 5.37 | 98% | 62.2° |
| 2038-05-20 Thu | 34 | — | unknown | 00:10–04:00 (marginal, 3.83 h) | 71.1° 05:30 | 5.32 | 94% | 54.1° |
| 2038-05-21 Fri | 36 | — | unknown | 00:00–04:00 (marginal, 4.0 h) | 71.1° 05:25 | 5.27 | 87% | 48.1° |
| 2038-05-22 Sat | 56 | — | unknown | 01:40–03:55 (good, 2.25 h) | 71.1° 05:20 | 5.22 | 78% | 44.9° |
| 2038-05-23 Sun | 69 | — | unknown | 00:15–03:55 (good, 3.67 h) | 71.1° 05:15 | 5.17 | 69% | 44.8° |
| 2038-05-24 Mon | 80 | — | unknown | 00:10–03:55 (good, 3.75 h) | 71.1° 05:10 | 5.12 | 59% | 47.5° |
| 2038-05-25 Tue | 90 | — | unknown | 00:05–03:55 (good, 3.83 h) | 71.1° 05:10 | 5.08 | 49% | 52.4° |
| 2038-05-26 Wed | 98 | — | unknown | 00:05–03:50 (good, 3.75 h) | 71.1° 05:05 | 5.03 | 40% | 58.8° |
| 2038-05-27 Thu | 100 | — | unknown | 00:00–03:50 (good, 3.83 h) | 71.1° 05:00 | 4.99 | 31% | 66.1° |
| 2038-05-28 Fri | 100 | — | unknown | 23:55–03:50 (good, 3.92 h) | 71.1° 04:55 | 4.95 | 22% | 74.0° |
| 2038-05-29 Sat | 100 | — | unknown | 23:50–03:50 (good, 4.0 h) | 71.1° 04:55 | 4.91 | 15% | 82.2° |
| 2038-05-30 Sun | 100 | — | unknown | 23:45–03:45 (good, 4.0 h) | 71.1° 04:50 | 4.87 | 9% | 90.6° |
| 2038-05-31 Mon | 100 | — | unknown | 23:45–03:45 (good, 4.0 h) | 71.1° 04:45 | 4.83 | 4% | 99.1° |
| 2038-06-01 Tue | 100 | — | unknown | 23:40–03:45 (good, 4.08 h) | 71.1° 04:40 | 4.79 | 1% | 107.5° |
| 2038-06-02 Wed | 100 | — | unknown | 23:35–03:45 (good, 4.17 h) | 71.1° 04:35 | 4.76 | 0% | 115.5° |
| 2038-06-03 Thu | 100 | — | unknown | 23:30–03:45 (good, 4.25 h) | 71.1° 04:35 | 4.72 | 1% | 122.8° |
| 2038-06-04 Fri | 100 | — | unknown | 23:30–03:45 (good, 4.25 h) | 71.1° 04:30 | 4.69 | 4% | 129.0° |
| 2038-06-05 Sat | 100 | — | unknown | 23:25–03:40 (good, 4.25 h) | 71.1° 04:25 | 4.66 | 8% | 133.5° |
| 2038-06-06 Sun | 100 | — | unknown | 23:20–03:40 (good, 4.33 h) | 71.1° 04:20 | 4.63 | 15% | 135.5° |
| 2038-06-07 Mon | 100 | — | unknown | 23:20–03:40 (good, 4.33 h) | 71.1° 04:15 | 4.6 | 23% | 134.5° |
| 2038-06-08 Tue | 100 | — | unknown | 23:15–03:40 (good, 4.42 h) | 71.1° 04:15 | 4.58 | 33% | 130.5° |
| 2038-06-09 Wed | 100 | — | unknown | 23:15–03:40 (good, 4.42 h) | 71.1° 04:10 | 4.55 | 44% | 124.2° |
| 2038-06-10 Thu | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 04:05 | 4.53 | 55% | 116.0° |
| 2038-06-11 Fri | 100 | — | unknown | 23:15–03:40 (good, 4.42 h) | 71.1° 04:00 | 4.51 | 66% | 106.7° |
| 2038-06-12 Sat | 100 | — | unknown | 23:15–03:40 (good, 4.42 h) | 71.1° 04:00 | 4.49 | 77% | 96.7° |
| 2038-06-13 Sun | 80 | — | unknown | 23:40–03:40 (good, 4.0 h) | 71.1° 03:55 | 4.48 | 86% | 86.3° |
| 2038-06-14 Mon | 66 | — | unknown | 00:35–03:40 (good, 3.08 h) | 71.1° 03:50 | 4.46 | 93% | 75.9° |
| 2038-06-15 Tue | 53 | — | unknown | 01:30–03:40 (good, 2.17 h) | 71.1° 03:45 | 4.45 | 98% | 66.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2038-05-17&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.