← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-04-21 Mon | 0 | — | unknown | — | 89.6° 12:10 | 6.96 | 0% | 31.8° |
| 2031-04-22 Tue | 0 | — | unknown | — | 89.7° 12:05 | 6.9 | 2% | 36.9° |
| 2031-04-23 Wed | 0 | — | unknown | — | 89.7° 12:00 | 6.84 | 5% | 44.5° |
| 2031-04-24 Thu | 0 | — | unknown | — | 89.5° 11:55 | 6.78 | 10% | 53.5° |
| 2031-04-25 Fri | 0 | — | unknown | — | 89.7° 11:50 | 6.72 | 16% | 63.1° |
| 2031-04-26 Sat | 0 | — | unknown | — | 89.7° 11:45 | 6.67 | 24% | 73.0° |
| 2031-04-27 Sun | 1 | — | unknown | — | 89.7° 11:40 | 6.61 | 32% | 83.1° |
| 2031-04-28 Mon | 1 | — | unknown | — | 89.5° 11:35 | 6.55 | 42% | 93.3° |
| 2031-04-29 Tue | 1 | — | unknown | — | 89.6° 11:35 | 6.49 | 51% | 103.5° |
| 2031-04-30 Wed | 1 | — | unknown | — | 89.7° 11:30 | 6.43 | 61% | 113.8° |
| 2031-05-01 Thu | 1 | — | unknown | — | 89.7° 11:25 | 6.38 | 70% | 123.9° |
| 2031-05-02 Fri | 1 | — | unknown | — | 89.6° 11:20 | 6.32 | 79% | 133.5° |
| 2031-05-03 Sat | 1 | — | unknown | — | 89.5° 11:15 | 6.26 | 87% | 142.0° |
| 2031-05-04 Sun | 1 | — | unknown | — | 89.6° 11:15 | 6.2 | 94% | 147.9° |
| 2031-05-05 Mon | 1 | — | unknown | — | 89.7° 11:10 | 6.14 | 98% | 149.2° |
| 2031-05-06 Tue | 1 | — | unknown | — | 89.7° 11:05 | 6.09 | 100% | 144.9° |
| 2031-05-07 Wed | 2 | — | unknown | — | 89.6° 11:00 | 6.03 | 99% | 136.4° |
| 2031-05-08 Thu | 2 | — | unknown | — | 89.5° 11:00 | 5.97 | 96% | 125.6° |
| 2031-05-09 Fri | 2 | — | unknown | — | 89.7° 10:55 | 5.92 | 89% | 113.7° |
| 2031-05-10 Sat | 2 | — | unknown | — | 89.7° 10:50 | 5.86 | 81% | 101.3° |
| 2031-05-11 Sun | 2 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.7° 10:45 | 5.81 | 71% | 88.8° |
| 2031-05-12 Mon | 2 | — | unknown | 04:05–04:10 (marginal, 0.08 h) | 89.5° 10:40 | 5.75 | 60% | 76.6° |
| 2031-05-13 Tue | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.6° 10:40 | 5.7 | 48% | 64.8° |
| 2031-05-14 Wed | 3 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.7° 10:35 | 5.64 | 38% | 53.8° |
| 2031-05-15 Thu | 3 | — | unknown | 03:55–04:05 (marginal, 0.17 h) | 89.7° 10:30 | 5.59 | 27% | 44.0° |
| 2031-05-16 Fri | 4 | — | unknown | 04:30–04:50 (marginal, 0.33 h) | 89.7° 10:25 | 5.54 | 18% | 36.0° |
| 2031-05-17 Sat | 6 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.5° 10:20 | 5.48 | 11% | 31.3° |
| 2031-05-18 Sun | 7 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 89.6° 10:20 | 5.43 | 6% | 31.0° |
| 2031-05-19 Mon | 7 | — | unknown | 04:10–04:45 (marginal, 0.58 h) | 89.7° 10:15 | 5.38 | 2% | 35.1° |
| 2031-05-20 Tue | 7 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.7° 10:10 | 5.33 | 0% | 42.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-04-21&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.