← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-03-17 Sat | 28 | — | unknown | 20:05–21:25 (good, 1.33 h) | 72.5° 16:25 | 8.84 | 24% | 5.7° |
| 2040-03-18 Sun | 23 | — | unknown | 20:05–21:15 (good, 1.17 h) | 72.5° 16:25 | 8.79 | 33% | 10.1° |
| 2040-03-19 Mon | 17 | — | unknown | 19:35–21:55 (marginal, 2.33 h) | 72.5° 16:20 | 8.74 | 42% | 21.5° |
| 2040-03-20 Tue | 13 | — | unknown | 20:10–21:45 (marginal, 1.58 h) | 72.5° 16:15 | 8.69 | 52% | 33.2° |
| 2040-03-21 Wed | 11 | — | unknown | 20:10–21:35 (marginal, 1.42 h) | 72.5° 16:10 | 8.64 | 61% | 44.9° |
| 2040-03-22 Thu | 10 | — | unknown | 20:10–21:30 (marginal, 1.33 h) | 72.5° 16:05 | 8.59 | 70% | 56.7° |
| 2040-03-23 Fri | 10 | — | unknown | 20:15–21:30 (marginal, 1.25 h) | 72.5° 16:05 | 8.53 | 78% | 68.7° |
| 2040-03-24 Sat | 11 | — | unknown | 20:15–21:30 (marginal, 1.25 h) | 72.5° 16:00 | 8.48 | 86% | 80.8° |
| 2040-03-25 Sun | 13 | — | unknown | 21:15–22:30 (marginal, 1.25 h) | 72.5° 16:55 | 8.43 | 92% | 93.2° |
| 2040-03-26 Mon | 14 | — | unknown | 21:15–21:40 (good, 0.42 h) | 72.5° 16:50 | 8.37 | 97% | 105.9° |
| 2040-03-27 Tue | 16 | — | unknown | 21:20–21:45 (good, 0.42 h) | 72.5° 16:45 | 8.32 | 99% | 118.9° |
| 2040-03-28 Wed | 15 | — | unknown | 21:20–21:45 (good, 0.42 h) | 72.5° 16:45 | 8.27 | 100% | 132.2° |
| 2040-03-29 Thu | 15 | — | unknown | 21:20–21:40 (good, 0.33 h) | 72.5° 16:40 | 8.21 | 98% | 145.7° |
| 2040-03-30 Fri | 15 | — | unknown | 21:25–21:45 (good, 0.33 h) | 72.5° 16:35 | 8.16 | 94% | 159.3° |
| 2040-03-31 Sat | 13 | — | unknown | 21:25–21:45 (good, 0.33 h) | 72.5° 16:30 | 8.1 | 87% | 172.2° |
| 2040-04-01 Sun | 11 | — | unknown | 21:25–21:40 (good, 0.25 h) | 72.5° 16:30 | 8.05 | 79% | 171.0° |
| 2040-04-02 Mon | 10 | — | unknown | 21:25–21:35 (good, 0.17 h) | 72.5° 16:25 | 7.99 | 68% | 157.6° |
| 2040-04-03 Tue | 8 | — | unknown | 20:55–22:00 (marginal, 1.08 h) | 72.5° 16:20 | 7.94 | 57% | 143.7° |
| 2040-04-04 Wed | 7 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 72.5° 16:15 | 7.88 | 46% | 129.6° |
| 2040-04-05 Thu | 6 | — | unknown | 20:55–21:25 (marginal, 0.5 h) | 72.5° 16:10 | 7.83 | 35% | 115.6° |
| 2040-04-06 Fri | 5 | — | unknown | 20:55–21:20 (marginal, 0.42 h) | 72.5° 16:10 | 7.77 | 24% | 101.5° |
| 2040-04-07 Sat | 3 | — | unknown | 21:00–21:15 (marginal, 0.25 h) | 72.5° 16:05 | 7.72 | 16% | 87.6° |
| 2040-04-08 Sun | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 16:00 | 7.66 | 8% | 73.8° |
| 2040-04-09 Mon | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:55 | 7.6 | 3% | 60.2° |
| 2040-04-10 Tue | 1 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:50 | 7.55 | 1% | 46.8° |
| 2040-04-11 Wed | 1 | — | unknown | — | 72.5° 15:50 | 7.49 | 0% | 33.7° |
| 2040-04-12 Thu | 1 | — | unknown | — | 72.5° 15:45 | 7.43 | 2% | 20.9° |
| 2040-04-13 Fri | 1 | — | unknown | — | 72.5° 15:40 | 7.37 | 6% | 9.0° |
| 2040-04-14 Sat | 0 | — | unknown | — | 72.5° 15:35 | 7.32 | 11% | 6.4° |
| 2040-04-15 Sun | 0 | — | unknown | — | 72.5° 15:35 | 7.26 | 18% | 17.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-03-17&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.