← 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. |
|---|---|---|---|---|---|---|---|---|
| 2028-05-01 Mon | 1 | — | unknown | — | 89.5° 11:20 | 6.33 | 48% | 100.6° |
| 2028-05-02 Tue | 1 | — | unknown | — | 89.6° 11:20 | 6.28 | 59% | 112.9° |
| 2028-05-03 Wed | 1 | — | unknown | — | 89.7° 11:15 | 6.22 | 70% | 124.9° |
| 2028-05-04 Thu | 1 | — | unknown | — | 89.7° 11:10 | 6.16 | 80% | 136.1° |
| 2028-05-05 Fri | 2 | — | unknown | — | 89.6° 11:05 | 6.1 | 89% | 145.5° |
| 2028-05-06 Sat | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.5° 11:05 | 6.05 | 95% | 151.1° |
| 2028-05-07 Sun | 2 | — | unknown | — | 89.6° 11:00 | 5.99 | 99% | 150.6° |
| 2028-05-08 Mon | 2 | — | unknown | — | 89.7° 10:55 | 5.93 | 100% | 144.5° |
| 2028-05-09 Tue | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.7° 10:50 | 5.88 | 98% | 135.3° |
| 2028-05-10 Wed | 3 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.6° 10:45 | 5.82 | 95% | 124.7° |
| 2028-05-11 Thu | 3 | — | unknown | 04:05–04:15 (marginal, 0.17 h) | 89.5° 10:45 | 5.77 | 89% | 113.7° |
| 2028-05-12 Fri | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.7° 10:40 | 5.71 | 82% | 102.6° |
| 2028-05-13 Sat | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.7° 10:35 | 5.66 | 73% | 91.6° |
| 2028-05-14 Sun | 3 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.7° 10:30 | 5.6 | 64% | 80.9° |
| 2028-05-15 Mon | 3 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.5° 10:25 | 5.55 | 55% | 70.5° |
| 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° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-05-01&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.