← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-05-06 Thu | 87 | — | unknown | 01:05–04:25 (good, 3.33 h) | 87.3° 07:20 | 6.09 | 0% | 76.7° |
| 2027-05-07 Fri | 87 | — | unknown | 01:05–04:20 (good, 3.25 h) | 87.3° 07:20 | 6.03 | 3% | 84.6° |
| 2027-05-08 Sat | 88 | — | unknown | 01:00–04:20 (good, 3.33 h) | 87.3° 07:15 | 5.98 | 8% | 92.8° |
| 2027-05-09 Sun | 89 | — | unknown | 00:55–04:15 (good, 3.33 h) | 87.3° 07:10 | 5.92 | 16% | 100.9° |
| 2027-05-10 Mon | 91 | — | unknown | 00:55–04:15 (good, 3.33 h) | 87.3° 07:05 | 5.86 | 25% | 108.6° |
| 2027-05-11 Tue | 91 | — | unknown | 00:50–04:15 (good, 3.42 h) | 87.3° 07:00 | 5.81 | 36% | 115.2° |
| 2027-05-12 Wed | 91 | — | unknown | 00:50–04:10 (good, 3.33 h) | 87.3° 07:00 | 5.75 | 47% | 120.4° |
| 2027-05-13 Thu | 92 | — | unknown | 00:45–04:10 (good, 3.42 h) | 87.3° 06:55 | 5.7 | 58% | 123.8° |
| 2027-05-14 Fri | 93 | — | unknown | 00:45–04:10 (good, 3.42 h) | 87.3° 06:50 | 5.64 | 69% | 124.9° |
| 2027-05-15 Sat | 91 | — | unknown | 00:40–04:05 (good, 3.42 h) | 87.3° 06:45 | 5.59 | 79% | 123.7° |
| 2027-05-16 Sun | 90 | — | unknown | 00:40–04:05 (good, 3.42 h) | 87.3° 06:40 | 5.54 | 87% | 120.5° |
| 2027-05-17 Mon | 81 | — | unknown | 00:40–04:05 (good, 3.42 h) | 87.3° 06:40 | 5.48 | 93% | 115.8° |
| 2027-05-18 Tue | 76 | — | unknown | 00:40–04:05 (good, 3.42 h) | 87.3° 06:35 | 5.43 | 97% | 109.8° |
| 2027-05-19 Wed | 69 | — | unknown | 00:40–04:00 (good, 3.33 h) | 87.3° 06:30 | 5.38 | 100% | 103.2° |
| 2027-05-20 Thu | 64 | — | unknown | 00:40–04:00 (good, 3.33 h) | 87.3° 06:25 | 5.33 | 100% | 96.2° |
| 2027-05-21 Fri | 60 | — | unknown | 00:40–04:00 (good, 3.33 h) | 87.3° 06:25 | 5.28 | 98% | 89.2° |
| 2027-05-22 Sat | 56 | — | unknown | 00:35–03:55 (good, 3.33 h) | 87.3° 06:20 | 5.23 | 94% | 82.2° |
| 2027-05-23 Sun | 57 | — | unknown | 00:30–03:55 (good, 3.42 h) | 87.3° 06:15 | 5.19 | 89% | 75.6° |
| 2027-05-24 Mon | 66 | — | unknown | 23:55–03:55 (good, 4.0 h) | 87.3° 06:10 | 5.14 | 82% | 69.5° |
| 2027-05-25 Tue | 74 | — | unknown | 23:50–03:55 (good, 4.08 h) | 87.3° 06:05 | 5.09 | 74% | 64.2° |
| 2027-05-26 Wed | 80 | — | unknown | 23:50–03:50 (good, 4.0 h) | 87.3° 06:05 | 5.05 | 66% | 59.8° |
| 2027-05-27 Thu | 88 | — | unknown | 23:45–03:50 (good, 4.08 h) | 87.3° 06:00 | 5.0 | 56% | 56.7° |
| 2027-05-28 Fri | 92 | — | unknown | 23:40–03:50 (good, 4.17 h) | 87.3° 05:55 | 4.96 | 47% | 55.1° |
| 2027-05-29 Sat | 95 | — | unknown | 23:35–03:50 (good, 4.25 h) | 87.3° 05:50 | 4.92 | 37% | 55.3° |
| 2027-05-30 Sun | 98 | — | unknown | 23:35–03:45 (good, 4.17 h) | 87.3° 05:45 | 4.88 | 27% | 57.4° |
| 2027-05-31 Mon | 100 | — | unknown | 23:30–03:45 (good, 4.25 h) | 87.3° 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) | 87.3° 05:30 | 4.73 | 1% | 81.4° |
| 2027-06-04 Fri | 100 | — | unknown | 23:15–03:45 (good, 4.5 h) | 87.3° 05:30 | 4.7 | 0% | 89.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-05-06&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.