← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-12-15 Wed | 33 | — | unknown | 18:35–19:45 (good, 1.17 h) | 71.1° 14:45 | 11.49 | 93% | 135.1° |
| 2027-12-16 Thu | 33 | — | unknown | 18:35–19:50 (good, 1.25 h) | 71.1° 14:45 | 11.5 | 86% | 138.3° |
| 2027-12-17 Fri | 32 | — | unknown | 18:35–19:45 (good, 1.17 h) | 71.1° 14:40 | 11.5 | 77% | 137.5° |
| 2027-12-18 Sat | 30 | — | unknown | 18:35–19:40 (good, 1.08 h) | 71.1° 14:35 | 11.5 | 66% | 133.0° |
| 2027-12-19 Sun | 29 | — | unknown | 18:35–19:40 (good, 1.08 h) | 71.1° 14:30 | 11.51 | 55% | 125.8° |
| 2027-12-20 Mon | 27 | — | unknown | 18:35–19:35 (good, 1.0 h) | 71.1° 14:30 | 11.51 | 44% | 117.1° |
| 2027-12-21 Tue | 25 | — | unknown | 18:35–19:30 (good, 0.92 h) | 71.1° 14:25 | 11.51 | 33% | 107.6° |
| 2027-12-22 Wed | 24 | — | unknown | 18:35–19:25 (good, 0.83 h) | 71.1° 14:20 | 11.51 | 24% | 97.8° |
| 2027-12-23 Thu | 22 | — | unknown | 18:40–19:20 (good, 0.67 h) | 71.1° 14:15 | 11.51 | 15% | 87.9° |
| 2027-12-24 Fri | 20 | — | unknown | 18:40–19:20 (good, 0.67 h) | 71.1° 14:10 | 11.5 | 8% | 78.3° |
| 2027-12-25 Sat | 19 | — | unknown | 18:40–19:15 (good, 0.58 h) | 71.1° 14:10 | 11.5 | 4% | 69.0° |
| 2027-12-26 Sun | 18 | — | unknown | 18:40–19:10 (good, 0.5 h) | 71.1° 14:05 | 11.5 | 1% | 60.5° |
| 2027-12-27 Mon | 17 | — | unknown | 18:40–19:05 (good, 0.42 h) | 71.1° 14:00 | 11.49 | 0% | 52.9° |
| 2027-12-28 Tue | 15 | — | unknown | 18:40–19:00 (good, 0.33 h) | 71.1° 13:55 | 11.49 | 1% | 46.9° |
| 2027-12-29 Wed | 13 | — | unknown | 18:40–19:00 (good, 0.33 h) | 71.1° 13:50 | 11.48 | 4% | 42.8° |
| 2027-12-30 Thu | 10 | — | unknown | 18:40–18:50 (good, 0.17 h) | 71.1° 13:50 | 11.47 | 9% | 41.4° |
| 2027-12-31 Fri | 8 | — | unknown | 18:10–19:20 (marginal, 1.17 h) | 71.1° 13:45 | 11.46 | 15% | 42.7° |
| 2028-01-01 Sat | 6 | — | unknown | 18:45–19:15 (marginal, 0.5 h) | 71.1° 13:40 | 11.45 | 22% | 46.5° |
| 2028-01-02 Sun | 5 | — | unknown | 18:45–19:10 (marginal, 0.42 h) | 71.1° 13:35 | 11.44 | 30% | 52.2° |
| 2028-01-03 Mon | 4 | — | unknown | 18:45–19:05 (marginal, 0.33 h) | 71.1° 13:30 | 11.43 | 39% | 59.3° |
| 2028-01-04 Tue | 3 | — | unknown | 18:45–19:00 (marginal, 0.25 h) | 71.1° 13:30 | 11.42 | 49% | 67.4° |
| 2028-01-05 Wed | 2 | — | unknown | 18:45–18:55 (marginal, 0.17 h) | 71.1° 13:25 | 11.41 | 58% | 76.3° |
| 2028-01-06 Thu | 2 | — | unknown | 18:45–18:55 (marginal, 0.17 h) | 71.1° 13:20 | 11.4 | 68% | 85.7° |
| 2028-01-07 Fri | 1 | — | unknown | — | 71.1° 13:15 | 11.38 | 78% | 95.6° |
| 2028-01-08 Sat | 1 | — | unknown | — | 71.1° 13:15 | 11.37 | 86% | 105.6° |
| 2028-01-09 Sun | 1 | — | unknown | — | 71.1° 13:10 | 11.35 | 93% | 115.6° |
| 2028-01-10 Mon | 1 | — | unknown | — | 71.1° 13:05 | 11.33 | 98% | 124.9° |
| 2028-01-11 Tue | 1 | — | unknown | — | 71.1° 13:00 | 11.31 | 100% | 132.6° |
| 2028-01-12 Wed | 0 | — | unknown | — | 71.1° 12:55 | 11.3 | 99% | 137.6° |
| 2028-01-13 Thu | 0 | — | unknown | — | 71.1° 12:55 | 11.28 | 95% | 138.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-12-15&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.