← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-05-21 Fri | 60 | — | unknown | 00:40–04:00 (good, 3.33 h) | 87.2° 06:25 | 5.28 | 98% | 89.2° |
| 2027-05-22 Sat | 57 | — | unknown | 00:35–03:55 (good, 3.33 h) | 87.2° 06:20 | 5.23 | 94% | 82.3° |
| 2027-05-23 Sun | 57 | — | unknown | 00:30–03:55 (good, 3.42 h) | 87.3° 06:15 | 5.19 | 89% | 75.7° |
| 2027-05-24 Mon | 66 | — | unknown | 23:55–03:55 (good, 4.0 h) | 87.3° 06:10 | 5.14 | 82% | 69.6° |
| 2027-05-25 Tue | 74 | — | unknown | 23:50–03:55 (good, 4.08 h) | 87.2° 06:05 | 5.09 | 74% | 64.2° |
| 2027-05-26 Wed | 80 | — | unknown | 23:50–03:50 (good, 4.0 h) | 87.2° 06:05 | 5.05 | 66% | 59.9° |
| 2027-05-27 Thu | 88 | — | unknown | 23:45–03:50 (good, 4.08 h) | 87.3° 06:00 | 5.0 | 56% | 56.8° |
| 2027-05-28 Fri | 92 | — | unknown | 23:40–03:50 (good, 4.17 h) | 87.3° 05:55 | 4.96 | 47% | 55.2° |
| 2027-05-29 Sat | 95 | — | unknown | 23:35–03:50 (good, 4.25 h) | 87.2° 05:50 | 4.92 | 37% | 55.4° |
| 2027-05-30 Sun | 98 | — | unknown | 23:30–03:45 (good, 4.25 h) | 87.2° 05:45 | 4.88 | 27% | 57.5° |
| 2027-05-31 Mon | 100 | — | unknown | 23:30–03:45 (good, 4.25 h) | 87.2° 05:45 | 4.84 | 19% | 61.3° |
| 2027-06-01 Tue | 100 | — | unknown | 23:25–03:45 (good, 4.33 h) | 87.3° 05:40 | 4.8 | 11% | 66.8° |
| 2027-06-02 Wed | 100 | — | unknown | 23:20–03:45 (good, 4.42 h) | 87.3° 05:35 | 4.77 | 5% | 73.6° |
| 2027-06-03 Thu | 100 | — | unknown | 23:15–03:45 (good, 4.5 h) | 87.2° 05:30 | 4.73 | 1% | 81.4° |
| 2027-06-04 Fri | 100 | — | unknown | 23:15–03:45 (good, 4.5 h) | 87.2° 05:30 | 4.7 | 0% | 89.7° |
| 2027-06-05 Sat | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 05:25 | 4.67 | 2% | 98.1° |
| 2027-06-06 Sun | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 87.3° 05:20 | 4.64 | 6% | 106.2° |
| 2027-06-07 Mon | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 87.3° 05:15 | 4.61 | 14% | 113.5° |
| 2027-06-08 Tue | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 87.2° 05:10 | 4.59 | 23% | 119.4° |
| 2027-06-09 Wed | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 87.2° 05:10 | 4.56 | 33% | 123.3° |
| 2027-06-10 Thu | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 87.2° 05:05 | 4.54 | 44% | 125.0° |
| 2027-06-11 Fri | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.3° 05:00 | 4.52 | 55% | 124.4° |
| 2027-06-12 Sat | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 04:55 | 4.5 | 66% | 121.6° |
| 2027-06-13 Sun | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 04:50 | 4.48 | 76% | 117.1° |
| 2027-06-14 Mon | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 04:50 | 4.47 | 84% | 111.5° |
| 2027-06-15 Tue | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.3° 04:45 | 4.45 | 91% | 105.0° |
| 2027-06-16 Wed | 84 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.3° 04:40 | 4.44 | 96% | 98.2° |
| 2027-06-17 Thu | 79 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 04:35 | 4.44 | 99% | 91.1° |
| 2027-06-18 Fri | 70 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 04:35 | 4.43 | 100% | 84.2° |
| 2027-06-19 Sat | 63 | — | unknown | 23:10–03:40 (good, 4.5 h) | 87.2° 04:30 | 4.42 | 99% | 77.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-05-21&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.