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 Vega: 03-05 (83), 03-04 (81), 03-03 (80), 03-02 (79), 03-01 (78) — by astronomy; check the weather when the night is within four days.

2033-02-04astronomy score per night — click a bar for that night2033-03-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-02-04 Fri	47	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:55	10.65	32%	95.0°
2033-02-05 Sat	49	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:50	10.61	43%	102.4°
2033-02-06 Sun	50	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:50	10.58	54%	109.2°
2033-02-07 Mon	51	—	unknown	03:50–05:55 (good, 2.08 h)	87.1° 09:45	10.54	65%	114.9°
2033-02-08 Tue	53	—	unknown	03:45–05:55 (good, 2.17 h)	87.1° 09:40	10.5	74%	119.3°
2033-02-09 Wed	52	—	unknown	03:50–05:50 (good, 2.0 h)	87.1° 09:35	10.47	82%	122.2°
2033-02-10 Thu	53	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:30	10.43	89%	123.3°
2033-02-11 Fri	48	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:30	10.39	95%	122.6°
2033-02-12 Sat	48	—	unknown	03:40–05:50 (good, 2.17 h)	87.1° 09:25	10.35	98%	120.3°
2033-02-13 Sun	45	—	unknown	03:40–05:45 (good, 2.08 h)	87.1° 09:20	10.31	100%	116.7°
2033-02-14 Mon	43	—	unknown	03:40–05:45 (good, 2.08 h)	87.1° 09:15	10.27	100%	111.9°
2033-02-15 Tue	41	—	unknown	03:45–05:45 (good, 2.0 h)	87.1° 09:15	10.23	98%	106.4°
2033-02-16 Wed	39	—	unknown	03:45–05:45 (good, 2.0 h)	87.1° 09:10	10.19	94%	100.3°
2033-02-17 Thu	36	—	unknown	03:45–05:40 (good, 1.92 h)	87.1° 09:05	10.15	88%	94.0°
2033-02-18 Fri	36	—	unknown	03:45–05:40 (good, 1.92 h)	87.1° 09:00	10.11	82%	87.5°
2033-02-19 Sat	37	—	unknown	03:35–05:40 (good, 2.08 h)	87.1° 08:55	10.07	74%	81.0°
2033-02-20 Sun	39	—	unknown	03:25–05:40 (good, 2.25 h)	87.1° 08:55	10.03	65%	74.7°
2033-02-21 Mon	42	—	unknown	03:15–05:35 (good, 2.33 h)	87.1° 08:50	9.99	56%	68.8°
2033-02-22 Tue	47	—	unknown	03:05–05:35 (good, 2.5 h)	87.1° 08:45	9.94	46%	63.7°
2033-02-23 Wed	54	—	unknown	02:45–05:35 (good, 2.83 h)	87.1° 08:40	9.9	35%	59.7°
2033-02-24 Thu	61	—	unknown	02:45–05:30 (good, 2.75 h)	87.1° 08:35	9.86	25%	57.2°
2033-02-25 Fri	68	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:35	9.81	16%	56.7°
2033-02-26 Sat	73	—	unknown	02:35–05:30 (good, 2.92 h)	87.1° 08:30	9.77	9%	58.5°
2033-02-27 Sun	76	—	unknown	02:30–05:30 (good, 3.0 h)	87.1° 08:25	9.72	3%	62.6°
2033-02-28 Mon	77	—	unknown	02:25–05:25 (good, 3.0 h)	87.1° 08:20	9.68	0%	68.6°
2033-03-01 Tue	78	—	unknown	02:25–05:25 (good, 3.0 h)	87.1° 08:20	9.63	1%	75.9°
2033-03-02 Wed	79	—	unknown	02:20–05:25 (good, 3.08 h)	87.1° 08:15	9.59	4%	83.9°
2033-03-03 Thu	80	—	unknown	02:15–05:20 (good, 3.08 h)	87.1° 08:10	9.54	10%	92.2°
2033-03-04 Fri	81	—	unknown	02:10–05:20 (good, 3.17 h)	87.1° 08:05	9.49	18%	100.1°
2033-03-05 Sat	83	—	unknown	02:10–05:20 (good, 3.17 h)	87.1° 08:00	9.45	28%	107.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-02-04&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.