← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-04-26 Thu | 51 | — | unknown | 02:10–04:40 (good, 2.5 h) | 87.3° 08:00 | 6.62 | 100% | 105.5° |
| 2040-04-27 Fri | 48 | — | unknown | 02:10–04:40 (good, 2.5 h) | 87.3° 07:55 | 6.56 | 99% | 99.6° |
| 2040-04-28 Sat | 45 | — | unknown | 02:05–04:35 (good, 2.5 h) | 87.3° 07:50 | 6.5 | 96% | 93.2° |
| 2040-04-29 Sun | 46 | — | unknown | 02:00–04:35 (good, 2.58 h) | 87.3° 07:45 | 6.44 | 90% | 86.5° |
| 2040-04-30 Mon | 46 | — | unknown | 01:55–04:30 (good, 2.58 h) | 87.2° 07:40 | 6.39 | 81% | 80.0° |
| 2040-05-01 Tue | 52 | — | unknown | 01:25–04:30 (good, 3.08 h) | 87.3° 07:40 | 6.33 | 71% | 74.1° |
| 2040-05-02 Wed | 64 | — | unknown | 01:20–04:30 (good, 3.17 h) | 87.3° 07:35 | 6.27 | 60% | 69.1° |
| 2040-05-03 Thu | 72 | — | unknown | 01:15–04:25 (good, 3.17 h) | 87.3° 07:30 | 6.21 | 49% | 65.4° |
| 2040-05-04 Fri | 79 | — | unknown | 01:10–04:25 (good, 3.25 h) | 87.3° 07:25 | 6.16 | 38% | 63.2° |
| 2040-05-05 Sat | 85 | — | unknown | 01:10–04:25 (good, 3.25 h) | 87.2° 07:25 | 6.1 | 27% | 62.7° |
| 2040-05-06 Sun | 86 | — | unknown | 01:05–04:20 (good, 3.25 h) | 87.3° 07:20 | 6.04 | 18% | 63.8° |
| 2040-05-07 Mon | 88 | — | unknown | 01:00–04:20 (good, 3.33 h) | 87.3° 07:15 | 5.98 | 11% | 66.4° |
| 2040-05-08 Tue | 90 | — | unknown | 00:55–04:20 (good, 3.42 h) | 87.3° 07:10 | 5.93 | 5% | 70.2° |
| 2040-05-09 Wed | 91 | — | unknown | 00:50–04:15 (good, 3.42 h) | 87.3° 07:05 | 5.87 | 2% | 74.8° |
| 2040-05-10 Thu | 91 | — | unknown | 00:50–04:15 (good, 3.42 h) | 87.3° 07:05 | 5.82 | 0% | 80.1° |
| 2040-05-11 Fri | 94 | — | unknown | 00:45–04:15 (good, 3.5 h) | 87.3° 07:00 | 5.76 | 1% | 85.6° |
| 2040-05-12 Sat | 94 | — | unknown | 00:40–04:10 (good, 3.5 h) | 87.3° 06:55 | 5.71 | 3% | 91.2° |
| 2040-05-13 Sun | 96 | — | unknown | 00:35–04:10 (good, 3.58 h) | 87.3° 06:50 | 5.65 | 7% | 96.7° |
| 2040-05-14 Mon | 97 | — | unknown | 00:30–04:10 (good, 3.67 h) | 87.2° 06:45 | 5.6 | 13% | 101.9° |
| 2040-05-15 Tue | 97 | — | unknown | 00:30–04:05 (good, 3.58 h) | 87.3° 06:45 | 5.55 | 20% | 106.6° |
| 2040-05-16 Wed | 98 | — | unknown | 00:30–04:05 (good, 3.58 h) | 87.3° 06:40 | 5.49 | 28% | 110.7° |
| 2040-05-17 Thu | 99 | — | unknown | 00:25–04:05 (good, 3.67 h) | 87.3° 06:35 | 5.44 | 37% | 113.9° |
| 2040-05-18 Fri | 98 | — | unknown | 00:25–04:00 (good, 3.58 h) | 87.3° 06:30 | 5.39 | 46% | 116.2° |
| 2040-05-19 Sat | 97 | — | unknown | 00:20–04:00 (good, 3.67 h) | 87.2° 06:30 | 5.34 | 56% | 117.3° |
| 2040-05-20 Sun | 97 | — | unknown | 00:20–04:00 (good, 3.67 h) | 87.3° 06:25 | 5.29 | 66% | 117.0° |
| 2040-05-21 Mon | 95 | — | unknown | 00:20–03:55 (good, 3.58 h) | 87.3° 06:20 | 5.24 | 75% | 115.2° |
| 2040-05-22 Tue | 85 | — | unknown | 00:20–03:55 (good, 3.58 h) | 87.3° 06:15 | 5.19 | 84% | 112.1° |
| 2040-05-23 Wed | 79 | — | unknown | 00:20–03:55 (good, 3.58 h) | 87.3° 06:10 | 5.15 | 91% | 107.7° |
| 2040-05-24 Thu | 73 | — | unknown | 00:20–03:55 (good, 3.58 h) | 87.3° 06:10 | 5.1 | 97% | 102.2° |
| 2040-05-25 Fri | 66 | — | unknown | 00:20–03:50 (good, 3.5 h) | 87.3° 06:05 | 5.05 | 100% | 95.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-04-26&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.