← 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. |
|---|---|---|---|---|---|---|---|---|
| 2037-04-03 Fri | 8 | — | unknown | 20:55–22:00 (marginal, 1.08 h) | 72.5° 16:20 | 7.95 | 84% | 171.0° |
| 2037-04-04 Sat | 7 | — | unknown | 20:55–21:55 (marginal, 1.0 h) | 72.5° 16:15 | 7.9 | 75% | 162.3° |
| 2037-04-05 Sun | 6 | — | unknown | 20:55–21:25 (marginal, 0.5 h) | 72.5° 16:15 | 7.84 | 65% | 150.3° |
| 2037-04-06 Mon | 5 | — | unknown | 20:55–21:20 (marginal, 0.42 h) | 72.5° 16:10 | 7.79 | 55% | 138.1° |
| 2037-04-07 Tue | 3 | — | unknown | 21:00–21:15 (marginal, 0.25 h) | 72.5° 16:05 | 7.73 | 46% | 126.0° |
| 2037-04-08 Wed | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 16:00 | 7.67 | 36% | 114.1° |
| 2037-04-09 Thu | 2 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 15:55 | 7.62 | 27% | 102.4° |
| 2037-04-10 Fri | 1 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:55 | 7.56 | 19% | 90.7° |
| 2037-04-11 Sat | 1 | — | unknown | — | 72.5° 15:50 | 7.5 | 12% | 79.0° |
| 2037-04-12 Sun | 1 | — | unknown | — | 72.5° 15:45 | 7.45 | 7% | 67.3° |
| 2037-04-13 Mon | 1 | — | unknown | — | 72.5° 15:40 | 7.39 | 3% | 55.5° |
| 2037-04-14 Tue | 1 | — | unknown | — | 72.5° 15:40 | 7.33 | 1% | 43.7° |
| 2037-04-15 Wed | 0 | — | unknown | — | 72.5° 15:35 | 7.27 | 0% | 31.9° |
| 2037-04-16 Thu | 0 | — | unknown | — | 72.5° 15:30 | 7.22 | 2% | 20.2° |
| 2037-04-17 Fri | 0 | — | unknown | — | 72.5° 15:25 | 7.16 | 5% | 10.3° |
| 2037-04-18 Sat | 0 | — | unknown | — | 72.5° 15:20 | 7.1 | 11% | 11.1° |
| 2037-04-19 Sun | 0 | — | unknown | — | 72.5° 15:20 | 7.04 | 18% | 21.7° |
| 2037-04-20 Mon | 0 | — | unknown | — | 72.5° 15:15 | 6.98 | 27% | 34.2° |
| 2037-04-21 Tue | 0 | — | unknown | — | 72.5° 15:10 | 6.93 | 37% | 47.3° |
| 2037-04-22 Wed | 0 | — | unknown | — | 72.5° 15:05 | 6.87 | 48% | 60.8° |
| 2037-04-23 Thu | 0 | — | unknown | — | 72.5° 15:00 | 6.81 | 59% | 74.7° |
| 2037-04-24 Fri | 0 | — | unknown | — | 72.5° 15:00 | 6.75 | 70% | 88.8° |
| 2037-04-25 Sat | 0 | — | unknown | — | 72.5° 14:55 | 6.69 | 80% | 103.1° |
| 2037-04-26 Sun | 0 | — | unknown | — | 72.5° 14:50 | 6.64 | 89% | 117.6° |
| 2037-04-27 Mon | 0 | — | unknown | — | 72.5° 14:45 | 6.58 | 95% | 132.0° |
| 2037-04-28 Tue | 0 | — | unknown | — | 72.5° 14:40 | 6.52 | 99% | 146.3° |
| 2037-04-29 Wed | 0 | — | unknown | — | 72.5° 14:40 | 6.46 | 100% | 159.9° |
| 2037-04-30 Thu | 0 | — | unknown | — | 72.5° 14:35 | 6.4 | 98% | 170.6° |
| 2037-05-01 Fri | 0 | — | unknown | — | 72.5° 14:30 | 6.34 | 94% | 166.9° |
| 2037-05-02 Sat | 0 | — | unknown | — | 72.5° 14:25 | 6.29 | 88% | 155.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-04-03&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.