← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-02-17 Tue | 53 | 0 | 0 | — | 79.1° 16:05 | 10.17 | 0% | 60.7° |
| 2026-02-18 Wed | 51 | 96 | 49 | 19:35–21:25 (good, 1.83 h) | 79.1° 16:00 | 10.12 | 2% | 48.0° |
| 2026-02-19 Thu | 47 | 0 | 0 | — | 79.1° 16:00 | 10.08 | 7% | 35.4° |
| 2026-02-20 Fri | 40 | 0 | 0 | — | 79.1° 15:55 | 10.04 | 14% | 23.8° |
| 2026-02-21 Sat | 34 | 0 | 0 | — | 79.1° 15:50 | 10.0 | 22% | 15.7° |
| 2026-02-22 Sun | 26 | 59 | 15 | 19:40–20:00 (good, 0.33 h) | 79.1° 15:45 | 9.96 | 32% | 17.7° |
| 2026-02-23 Mon | 19 | 14 | 3 | — | 79.1° 15:45 | 9.91 | 43% | 27.7° |
| 2026-02-24 Tue | 15 | 40 | 6 | 21:00–21:30 (marginal, 0.5 h) | 79.1° 15:40 | 9.87 | 55% | 40.1° |
| 2026-02-25 Wed | 13 | 100 | 13 | 19:40–21:20 (marginal, 1.67 h) | 79.1° 15:35 | 9.83 | 66% | 53.3° |
| 2026-02-26 Thu | 12 | 94 | 11 | 19:45–21:15 (marginal, 1.5 h) | 79.1° 15:30 | 9.78 | 76% | 66.8° |
| 2026-02-27 Fri | 14 | 85 | 12 | 19:45–21:00 (marginal, 1.25 h) | 79.1° 15:25 | 9.74 | 85% | 80.4° |
| 2026-02-28 Sat | 16 | 100 | 16 | 19:45–19:55 (good, 0.17 h) | 79.1° 15:25 | 9.69 | 92% | 93.8° |
| 2026-03-01 Sun | 19 | 100 | 19 | 19:45–20:30 (good, 0.75 h) | 79.1° 15:20 | 9.65 | 97% | 107.2° |
| 2026-03-02 Mon | 21 | 48 | 10 | 19:45–20:45 (marginal, 1.0 h) | 79.1° 15:15 | 9.6 | 100% | 120.2° |
| 2026-03-03 Tue | 20 | 0 | 0 | — | 79.1° 15:10 | 9.56 | 100% | 132.8° |
| 2026-03-04 Wed | 21 | 2 | 0 | — | 79.1° 15:05 | 9.51 | 98% | 144.8° |
| 2026-03-05 Thu | 22 | 0 | 0 | — | 79.1° 15:05 | 9.46 | 94% | 155.6° |
| 2026-03-06 Fri | 21 | 82 | 17 | 19:50–20:05 (good, 0.25 h) | 79.1° 15:00 | 9.41 | 88% | 163.5° |
| 2026-03-07 Sat | 19 | 80 | 15 | 19:55–20:00 (good, 0.08 h) | 79.1° 14:55 | 9.37 | 81% | 164.0° |
| 2026-03-08 Sun | 17 | 61 | 10 | 19:55–20:45 (marginal, 0.83 h) | 79.1° 14:50 | 9.32 | 72% | 157.1° |
| 2026-03-09 Mon | 15 | 38 | 6 | 19:55–20:00 (marginal, 0.08 h) | 79.1° 14:45 | 9.27 | 64% | 147.4° |
| 2026-03-10 Tue | 14 | 100 | 14 | 19:55–20:15 (good, 0.33 h) | 79.1° 14:45 | 9.22 | 54% | 136.7° |
| 2026-03-11 Wed | 11 | 46 | 5 | — | 79.1° 14:40 | 9.17 | 45% | 125.6° |
| 2026-03-12 Thu | 9 | 1 | 0 | — | 79.1° 14:35 | 9.13 | 36% | 114.2° |
| 2026-03-13 Fri | 8 | 100 | 8 | 20:00–20:05 (good, 0.08 h) | 79.1° 14:30 | 9.08 | 27% | 102.5° |
| 2026-03-14 Sat | 7 | 100 | 7 | 19:30–20:30 (marginal, 1.0 h) | 79.1° 14:30 | 9.03 | 18% | 90.5° |
| 2026-03-15 Sun | 5 | 100 | 5 | 20:05–20:25 (marginal, 0.33 h) | 79.1° 14:25 | 8.98 | 11% | 78.2° |
| 2026-03-16 Mon | 4 | 0 | 0 | — | 79.1° 14:20 | 8.93 | 5% | 65.6° |
| 2026-03-17 Tue | 4 | 0 | 0 | — | 79.1° 14:15 | 8.88 | 2% | 52.7° |
| 2026-03-18 Wed | 3 | 0 | 0 | — | 79.1° 14:10 | 8.82 | 0% | 39.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-02-17&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.