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Rozhen Observation Calendar

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.

Best nights for 3C 273: 12-30 (89), 12-29 (88), 12-28 (86), 12-27 (84), 12-26 (83) — by astronomy; check the weather when the night is within four days.
2033-12-01astronomy score per night — click a bar for that night2033-12-30
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2033-12-01 Thu 39 — unknown 04:20–05:55 (good, 1.58 h) 50.2° 08:05 11.34 75% 173.7°
2033-12-02 Fri 41 — unknown 04:15–05:55 (good, 1.67 h) 50.2° 08:00 11.35 84% 161.1°
2033-12-03 Sat 41 — unknown 04:20–05:55 (good, 1.58 h) 50.2° 08:00 11.37 92% 146.6°
2033-12-04 Sun 37 — unknown 04:20–05:55 (good, 1.58 h) 50.2° 07:55 11.38 97% 131.9°
2033-12-05 Mon 36 — unknown 04:15–05:55 (good, 1.67 h) 50.2° 07:50 11.4 100% 117.3°
2033-12-06 Tue 30 — unknown 04:25–05:55 (good, 1.5 h) 50.2° 07:45 11.41 99% 102.7°
2033-12-07 Wed 24 — unknown 05:25–06:00 (good, 0.58 h) 50.2° 07:45 11.42 96% 88.5°
2033-12-08 Thu 20 — unknown 03:40–06:00 (marginal, 2.33 h) 50.2° 07:40 11.44 91% 74.7°
2033-12-09 Fri 17 — unknown 03:40–06:00 (marginal, 2.33 h) 50.2° 07:35 11.45 84% 61.2°
2033-12-10 Sat 16 — unknown 03:40–06:00 (marginal, 2.33 h) 50.2° 07:30 11.46 76% 48.3°
2033-12-11 Sun 17 — unknown 03:30–06:00 (marginal, 2.5 h) 50.2° 07:25 11.47 66% 35.7°
2033-12-12 Mon 21 — unknown 03:20–06:00 (marginal, 2.67 h) 50.2° 07:25 11.47 57% 23.6°
2033-12-13 Tue 28 — unknown 05:30–06:05 (good, 0.58 h) 50.2° 07:20 11.48 47% 12.1°
2033-12-14 Wed 36 — unknown 03:50–06:05 (good, 2.25 h) 50.2° 07:15 11.49 38% 5.1°
2033-12-15 Thu 44 — unknown 03:40–06:05 (good, 2.42 h) 50.2° 07:10 11.49 29% 13.6°
2033-12-16 Fri 53 — unknown 03:30–06:05 (good, 2.58 h) 50.2° 07:05 11.5 21% 25.0°
2033-12-17 Sat 60 — unknown 03:15–06:05 (good, 2.83 h) 50.2° 07:05 11.5 14% 36.7°
2033-12-18 Sun 66 — unknown 03:15–06:05 (good, 2.83 h) 50.2° 07:00 11.5 8% 48.7°
2033-12-19 Mon 71 — unknown 03:10–06:05 (good, 2.92 h) 50.2° 06:55 11.51 4% 60.8°
2033-12-20 Tue 72 — unknown 03:05–06:05 (good, 3.0 h) 50.2° 06:50 11.51 1% 73.2°
2033-12-21 Wed 73 — unknown 03:00–06:05 (good, 3.08 h) 50.2° 06:50 11.51 0% 85.8°
2033-12-22 Thu 76 — unknown 02:55–06:10 (good, 3.25 h) 50.2° 06:45 11.51 2% 98.7°
2033-12-23 Fri 78 — unknown 02:55–06:10 (good, 3.25 h) 50.2° 06:40 11.5 5% 111.8°
2033-12-24 Sat 79 — unknown 02:50–06:10 (good, 3.33 h) 50.2° 06:35 11.5 11% 125.0°
2033-12-25 Sun 82 — unknown 02:45–06:10 (good, 3.42 h) 50.2° 06:30 11.5 18% 138.4°
2033-12-26 Mon 83 — unknown 02:40–06:10 (good, 3.5 h) 50.2° 06:30 11.49 28% 151.9°
2033-12-27 Tue 84 — unknown 02:35–06:10 (good, 3.58 h) 50.2° 06:25 11.49 38% 165.3°
2033-12-28 Wed 86 — unknown 02:35–06:10 (good, 3.58 h) 50.2° 06:20 11.48 49% 175.1°
2033-12-29 Thu 88 — unknown 02:30–06:10 (good, 3.67 h) 50.2° 06:15 11.48 60% 164.9°
2033-12-30 Fri 89 — unknown 02:30–06:10 (good, 3.67 h) 50.2° 06:10 11.47 71% 151.1°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-12-01&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One 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.