← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-03-12 Fri | 5 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 89.7° 13:45 | 9.14 | 21% | 33.3° |
| 2027-03-13 Sat | 4 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 89.6° 13:40 | 9.09 | 31% | 41.5° |
| 2027-03-14 Sun | 3 | — | unknown | 20:00–20:20 (marginal, 0.33 h) | 89.5° 13:40 | 9.04 | 42% | 51.8° |
| 2027-03-15 Mon | 2 | — | unknown | 20:00–20:10 (marginal, 0.17 h) | 89.7° 13:35 | 8.99 | 53% | 63.3° |
| 2027-03-16 Tue | 1 | — | unknown | — | 89.7° 13:30 | 8.94 | 64% | 75.5° |
| 2027-03-17 Wed | 1 | — | unknown | — | 89.7° 13:25 | 8.89 | 75% | 88.1° |
| 2027-03-18 Thu | 1 | — | unknown | — | 89.5° 13:20 | 8.84 | 84% | 100.7° |
| 2027-03-19 Fri | 1 | — | unknown | — | 89.6° 13:20 | 8.79 | 92% | 113.3° |
| 2027-03-20 Sat | 1 | — | unknown | — | 89.7° 13:15 | 8.73 | 97% | 125.4° |
| 2027-03-21 Sun | 0 | — | unknown | — | 89.7° 13:10 | 8.68 | 100% | 136.4° |
| 2027-03-22 Mon | 0 | — | unknown | — | 89.6° 13:05 | 8.63 | 100% | 145.4° |
| 2027-03-23 Tue | 0 | — | unknown | — | 89.5° 13:00 | 8.58 | 97% | 150.8° |
| 2027-03-24 Wed | 0 | — | unknown | — | 89.6° 13:00 | 8.53 | 92% | 150.7° |
| 2027-03-25 Thu | 0 | — | unknown | — | 89.7° 12:55 | 8.47 | 86% | 145.8° |
| 2027-03-26 Fri | 0 | — | unknown | — | 89.7° 12:50 | 8.42 | 78% | 137.9° |
| 2027-03-27 Sat | 0 | — | unknown | — | 89.6° 12:45 | 8.37 | 70% | 128.6° |
| 2027-03-28 Sun | 0 | — | unknown | — | 89.5° 13:45 | 8.31 | 60% | 118.7° |
| 2027-03-29 Mon | 0 | — | unknown | — | 89.6° 13:40 | 8.26 | 51% | 108.5° |
| 2027-03-30 Tue | 0 | — | unknown | — | 89.7° 13:35 | 8.2 | 42% | 98.2° |
| 2027-03-31 Wed | 0 | — | unknown | — | 89.7° 13:30 | 8.15 | 32% | 87.8° |
| 2027-04-01 Thu | 0 | — | unknown | — | 89.5° 13:25 | 8.1 | 24% | 77.4° |
| 2027-04-02 Fri | 0 | — | unknown | — | 89.6° 13:25 | 8.04 | 16% | 66.9° |
| 2027-04-03 Sat | 0 | — | unknown | — | 89.7° 13:20 | 7.99 | 10% | 56.6° |
| 2027-04-04 Sun | 0 | — | unknown | — | 89.7° 13:15 | 7.93 | 5% | 46.7° |
| 2027-04-05 Mon | 0 | — | unknown | — | 89.6° 13:10 | 7.87 | 1% | 37.8° |
| 2027-04-06 Tue | 0 | — | unknown | — | 89.5° 13:05 | 7.82 | 0% | 31.1° |
| 2027-04-07 Wed | 0 | — | unknown | — | 89.6° 13:05 | 7.76 | 1% | 28.6° |
| 2027-04-08 Thu | 0 | — | unknown | — | 89.7° 13:00 | 7.71 | 5% | 31.7° |
| 2027-04-09 Fri | 0 | — | unknown | — | 89.7° 12:55 | 7.65 | 10% | 39.3° |
| 2027-04-10 Sat | 0 | — | unknown | — | 89.6° 12:50 | 7.59 | 18% | 49.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-03-12&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.