← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-07-13 Mon | 2 | 92 | 2 | — | 72.5° 09:40 | 4.91 | 0% | 45.0° |
| 2026-07-14 Tue | 2 | 99 | 2 | 04:30–04:45 (marginal, 0.25 h) | 72.5° 09:35 | 4.96 | 0% | 60.0° |
| 2026-07-15 Wed | 3 | 94 | 3 | 04:30–04:50 (marginal, 0.33 h) | 72.5° 09:35 | 5.0 | 3% | 74.8° |
| 2026-07-16 Thu | 4 | 83 | 3 | 04:30–04:50 (marginal, 0.33 h) | 72.5° 09:30 | 5.04 | 9% | 89.2° |
| 2026-07-17 Fri | 5 | 99 | 5 | 04:20–04:50 (marginal, 0.5 h) | 72.5° 09:25 | 5.08 | 16% | 103.2° |
| 2026-07-18 Sat | 6 | 77 | 5 | 03:50–04:05 (marginal, 0.25 h) | 72.5° 09:20 | 5.13 | 25% | 116.8° |
| 2026-07-19 Sun | 7 | 99 | 7 | 04:10–04:55 (marginal, 0.75 h) | 72.5° 09:15 | 5.18 | 35% | 129.8° |
| 2026-07-20 Mon | 8 | 96 | 8 | 03:40–04:55 (marginal, 1.25 h) | 72.5° 09:15 | 5.22 | 45% | 142.5° |
| 2026-07-21 Tue | 11 | 61 | 7 | 04:20–04:55 (marginal, 0.58 h) | 72.5° 09:10 | 5.27 | 55% | 154.8° |
| 2026-07-22 Wed | 12 | 99 | 12 | 04:00–04:10 (good, 0.17 h) | 72.5° 09:05 | 5.32 | 64% | 166.9° |
| 2026-07-23 Thu | 13 | 33 | 4 | 03:30–04:00 (marginal, 0.5 h) | 72.5° 09:00 | 5.37 | 73% | 178.5° |
| 2026-07-24 Fri | 17 | 0 | 0 | — | 72.5° 08:55 | 5.42 | 81% | 169.2° |
| 2026-07-25 Sat | 19 | 92 | 17 | 03:55–04:15 (good, 0.33 h) | 72.5° 08:55 | 5.47 | 88% | 157.4° |
| 2026-07-26 Sun | 20 | 75 | 15 | 03:55–04:00 (good, 0.08 h) | 72.5° 08:50 | 5.52 | 93% | 145.5° |
| 2026-07-27 Mon | 19 | 98 | 19 | 03:50–04:20 (good, 0.5 h) | 72.5° 08:45 | 5.58 | 97% | 133.6° |
| 2026-07-28 Tue | 20 | 83 | 17 | 03:10–04:20 (marginal, 1.17 h) | 72.5° 08:40 | 5.63 | 100% | 121.6° |
| 2026-07-29 Wed | 18 | 100 | 18 | 03:50–04:20 (good, 0.5 h) | 72.5° 08:40 | 5.68 | 100% | 109.3° |
| 2026-07-30 Thu | 16 | 100 | 16 | 03:55–04:20 (good, 0.42 h) | 72.5° 08:35 | 5.74 | 98% | 97.0° |
| 2026-07-31 Fri | 14 | 100 | 14 | 03:00–04:25 (marginal, 1.42 h) | 72.5° 08:30 | 5.79 | 95% | 84.4° |
| 2026-08-01 Sat | 12 | 100 | 12 | 03:05–04:25 (marginal, 1.33 h) | 72.5° 08:25 | 5.85 | 89% | 71.6° |
| 2026-08-02 Sun | 11 | 100 | 11 | 03:05–04:25 (marginal, 1.33 h) | 72.5° 08:20 | 5.9 | 82% | 58.7° |
| 2026-08-03 Mon | 11 | 100 | 11 | 03:00–04:30 (marginal, 1.5 h) | 72.5° 08:20 | 5.96 | 73% | 45.5° |
| 2026-08-04 Tue | 11 | 99 | 11 | 02:55–04:30 (marginal, 1.58 h) | 72.5° 08:15 | 6.01 | 63% | 32.0° |
| 2026-08-05 Wed | 16 | 97 | 16 | 02:45–04:30 (marginal, 1.75 h) | 72.5° 08:10 | 6.07 | 52% | 18.3° |
| 2026-08-06 Thu | 22 | 97 | 21 | 03:35–04:35 (good, 1.0 h) | 72.5° 08:05 | 6.13 | 40% | 4.4° |
| 2026-08-07 Fri | 29 | 100 | 29 | 03:10–04:35 (good, 1.42 h) | 72.5° 08:00 | 6.18 | 30% | 10.0° |
| 2026-08-08 Sat | 36 | 63 | 23 | 02:25–04:35 (marginal, 2.17 h) | 72.5° 08:00 | 6.24 | 19% | 24.5° |
| 2026-08-09 Sun | 44 | 99 | 44 | 02:55–04:40 (good, 1.75 h) | 72.5° 07:55 | 6.3 | 11% | 39.1° |
| 2026-08-10 Mon | 49 | 100 | 49 | 02:45–04:40 (good, 1.92 h) | 72.5° 07:50 | 6.35 | 5% | 53.9° |
| 2026-08-11 Tue | 52 | 100 | 52 | 02:40–04:40 (good, 2.0 h) | 72.5° 07:45 | 6.41 | 1% | 68.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-07-13&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.