← 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. |
|---|---|---|---|---|---|---|---|---|
| 2028-05-16 Tue | 4 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.6° 10:25 | 5.5 | 46% | 60.3° |
| 2028-05-17 Wed | 5 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.7° 10:20 | 5.45 | 36% | 50.7° |
| 2028-05-18 Thu | 5 | — | unknown | 03:40–04:00 (marginal, 0.33 h) | 89.7° 10:15 | 5.39 | 27% | 41.7° |
| 2028-05-19 Fri | 6 | — | unknown | 03:35–04:00 (marginal, 0.42 h) | 89.6° 10:10 | 5.34 | 19% | 34.2° |
| 2028-05-20 Sat | 8 | — | unknown | 03:30–04:00 (marginal, 0.5 h) | 89.5° 10:10 | 5.29 | 12% | 29.2° |
| 2028-05-21 Sun | 9 | — | unknown | 04:00–04:45 (marginal, 0.75 h) | 89.6° 10:05 | 5.24 | 6% | 28.6° |
| 2028-05-22 Mon | 9 | — | unknown | 03:25–04:45 (marginal, 1.33 h) | 89.7° 10:00 | 5.2 | 2% | 32.8° |
| 2028-05-23 Tue | 10 | — | unknown | 03:50–03:55 (good, 0.08 h) | 89.7° 09:55 | 5.15 | 0% | 40.6° |
| 2028-05-24 Wed | 11 | — | unknown | 03:50–03:55 (good, 0.08 h) | 89.6° 09:50 | 5.1 | 0% | 50.5° |
| 2028-05-25 Thu | 12 | — | unknown | 03:45–03:50 (good, 0.08 h) | 89.5° 09:50 | 5.06 | 3% | 61.6° |
| 2028-05-26 Fri | 13 | — | unknown | 03:40–03:50 (good, 0.17 h) | 89.7° 09:45 | 5.01 | 8% | 73.4° |
| 2028-05-27 Sat | 14 | — | unknown | 03:35–03:50 (good, 0.25 h) | 89.7° 09:40 | 4.97 | 15% | 85.6° |
| 2028-05-28 Sun | 15 | — | unknown | 03:30–03:50 (good, 0.33 h) | 89.7° 09:35 | 4.93 | 24% | 98.0° |
| 2028-05-29 Mon | 16 | — | unknown | 03:30–03:50 (good, 0.33 h) | 89.5° 09:30 | 4.89 | 34% | 110.3° |
| 2028-05-30 Tue | 17 | — | unknown | 03:25–03:45 (good, 0.33 h) | 89.6° 09:30 | 4.85 | 46% | 122.3° |
| 2028-05-31 Wed | 18 | — | unknown | 03:20–03:45 (good, 0.42 h) | 89.7° 09:25 | 4.81 | 57% | 133.6° |
| 2028-06-01 Thu | 19 | — | unknown | 03:15–03:45 (good, 0.5 h) | 89.7° 09:20 | 4.78 | 68% | 143.4° |
| 2028-06-02 Fri | 21 | — | unknown | 03:15–03:45 (good, 0.5 h) | 89.6° 09:15 | 4.74 | 78% | 150.1° |
| 2028-06-03 Sat | 22 | — | unknown | 03:15–03:45 (good, 0.5 h) | 89.5° 09:10 | 4.71 | 87% | 151.5° |
| 2028-06-04 Sun | 20 | — | unknown | 03:15–03:40 (good, 0.42 h) | 89.6° 09:10 | 4.68 | 93% | 147.1° |
| 2028-06-05 Mon | 20 | — | unknown | 03:10–03:40 (good, 0.5 h) | 89.7° 09:05 | 4.65 | 98% | 138.7° |
| 2028-06-06 Tue | 20 | — | unknown | 03:10–03:40 (good, 0.5 h) | 89.7° 09:00 | 4.62 | 100% | 128.6° |
| 2028-06-07 Wed | 21 | — | unknown | 03:05–03:40 (good, 0.58 h) | 89.6° 08:55 | 4.59 | 99% | 117.7° |
| 2028-06-08 Thu | 19 | — | unknown | 03:10–03:40 (good, 0.5 h) | 89.5° 08:55 | 4.57 | 97% | 106.6° |
| 2028-06-09 Fri | 18 | — | unknown | 03:10–03:40 (good, 0.5 h) | 89.7° 08:50 | 4.54 | 92% | 95.5° |
| 2028-06-10 Sat | 17 | — | unknown | 03:20–03:40 (good, 0.33 h) | 89.7° 08:45 | 4.52 | 86% | 84.6° |
| 2028-06-11 Sun | 16 | — | unknown | 02:05–03:40 (marginal, 1.58 h) | 89.7° 08:40 | 4.5 | 79% | 73.9° |
| 2028-06-12 Mon | 17 | — | unknown | 02:00–03:40 (marginal, 1.67 h) | 89.5° 08:35 | 4.49 | 71% | 63.6° |
| 2028-06-13 Tue | 18 | — | unknown | 01:55–04:30 (marginal, 2.58 h) | 89.6° 08:35 | 4.47 | 62% | 53.7° |
| 2028-06-14 Wed | 20 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.7° 08:30 | 4.46 | 52% | 44.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-05-16&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.