← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-02-15 Sun | 88 | 0 | 0 | — | 42.9° 20:15 | 10.25 | 3% | 126.2° |
| 2026-02-16 Mon | 86 | 12 | 11 | 19:30–20:00 (marginal, 0.5 h) | 42.9° 20:10 | 10.21 | 0% | 116.4° |
| 2026-02-17 Tue | 85 | 0 | 0 | — | 42.9° 20:05 | 10.17 | 0% | 105.8° |
| 2026-02-18 Wed | 83 | 97 | 80 | 19:35–23:20 (good, 3.75 h) | 42.9° 20:05 | 10.12 | 2% | 94.7° |
| 2026-02-19 Thu | 81 | 0 | 0 | — | 42.9° 20:00 | 10.08 | 7% | 83.4° |
| 2026-02-20 Fri | 75 | 0 | 0 | — | 42.9° 19:55 | 10.04 | 14% | 72.0° |
| 2026-02-21 Sat | 66 | 0 | 0 | — | 42.9° 19:50 | 10.0 | 22% | 60.9° |
| 2026-02-22 Sun | 53 | 33 | 17 | 19:40–20:00 (good, 0.33 h) | 42.9° 19:45 | 9.96 | 32% | 50.6° |
| 2026-02-23 Mon | 40 | 7 | 3 | — | 42.9° 19:45 | 9.91 | 43% | 41.7° |
| 2026-02-24 Tue | 28 | 67 | 19 | 21:00–23:25 (marginal, 2.42 h) | 42.9° 19:40 | 9.87 | 55% | 35.6° |
| 2026-02-25 Wed | 19 | 95 | 18 | 19:40–23:00 (marginal, 3.33 h) | 42.9° 19:35 | 9.83 | 66% | 33.8° |
| 2026-02-26 Thu | 14 | 94 | 13 | 19:45–22:35 (marginal, 2.83 h) | 42.9° 19:30 | 9.78 | 76% | 37.1° |
| 2026-02-27 Fri | 13 | 55 | 7 | 19:45–21:00 (marginal, 1.25 h) | 42.9° 19:25 | 9.74 | 85% | 44.2° |
| 2026-02-28 Sat | 14 | 100 | 14 | 19:45–22:25 (marginal, 2.67 h) | 42.9° 19:25 | 9.69 | 92% | 53.5° |
| 2026-03-01 Sun | 19 | 100 | 19 | 19:45–22:35 (marginal, 2.83 h) | 42.9° 19:20 | 9.65 | 97% | 64.0° |
| 2026-03-02 Mon | 25 | 26 | 7 | 20:00–20:25 (marginal, 0.42 h) | 42.9° 19:15 | 9.6 | 100% | 74.9° |
| 2026-03-03 Tue | 32 | 0 | 0 | — | 42.9° 19:10 | 9.56 | 100% | 86.0° |
| 2026-03-04 Wed | 41 | 1 | 0 | — | 42.9° 19:10 | 9.51 | 98% | 96.8° |
| 2026-03-05 Thu | 53 | 11 | 6 | 22:00–22:25 (marginal, 0.42 h) | 42.9° 19:05 | 9.46 | 94% | 107.3° |
| 2026-03-06 Fri | 55 | 67 | 37 | 19:50–21:00 (good, 1.17 h) | 42.9° 19:00 | 9.41 | 88% | 117.3° |
| 2026-03-07 Sat | 54 | 79 | 43 | 19:55–20:30 (good, 0.58 h) | 42.9° 18:55 | 9.37 | 81% | 126.5° |
| 2026-03-08 Sun | 52 | 59 | 30 | 21:00–21:45 (good, 0.75 h) | 42.9° 18:50 | 9.32 | 72% | 134.7° |
| 2026-03-09 Mon | 51 | 49 | 25 | 21:00–22:40 (marginal, 1.67 h) | 42.9° 18:50 | 9.27 | 64% | 141.2° |
| 2026-03-10 Tue | 49 | 99 | 49 | 19:55–22:00 (good, 2.08 h) | 42.9° 18:45 | 9.22 | 54% | 145.3° |
| 2026-03-11 Wed | 47 | 23 | 11 | 20:00–21:00 (marginal, 1.0 h) | 42.9° 18:40 | 9.17 | 45% | 146.1° |
| 2026-03-12 Thu | 45 | 0 | 0 | — | 42.9° 18:35 | 9.13 | 36% | 143.3° |
| 2026-03-13 Fri | 43 | 100 | 43 | 20:00–21:50 (good, 1.83 h) | 42.9° 18:30 | 9.08 | 27% | 137.5° |
| 2026-03-14 Sat | 42 | 100 | 42 | 20:00–21:50 (good, 1.83 h) | 42.9° 18:30 | 9.03 | 18% | 129.6° |
| 2026-03-15 Sun | 40 | 97 | 39 | 20:05–21:40 (good, 1.58 h) | 42.9° 18:25 | 8.98 | 11% | 120.3° |
| 2026-03-16 Mon | 38 | 2 | 1 | — | 42.9° 18:20 | 8.93 | 5% | 110.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-02-15&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.