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: 03-02 (79), 03-01 (77), 02-28 (74), 02-27 (69), 02-26 (62) — by astronomy; check the weather when the night is within four days.

2030-02-01astronomy score per night — click a bar for that night2030-03-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-02-01 Fri	43	—	unknown	04:15–06:00 (good, 1.75 h)	87.1° 10:10	10.76	1%	60.1°
2030-02-02 Sat	45	—	unknown	04:10–06:00 (good, 1.83 h)	87.1° 10:05	10.72	0%	62.4°
2030-02-03 Sun	47	—	unknown	04:05–06:00 (good, 1.92 h)	87.1° 10:00	10.69	2%	66.3°
2030-02-04 Mon	47	—	unknown	04:05–05:55 (good, 1.83 h)	87.1° 09:55	10.65	6%	71.2°
2030-02-05 Tue	49	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:55	10.62	12%	76.8°
2030-02-06 Wed	49	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:50	10.58	19%	82.8°
2030-02-07 Thu	51	—	unknown	03:50–05:55 (good, 2.08 h)	87.1° 09:45	10.55	27%	88.9°
2030-02-08 Fri	53	—	unknown	03:45–05:55 (good, 2.17 h)	87.1° 09:40	10.51	36%	94.9°
2030-02-09 Sat	53	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:35	10.48	45%	100.8°
2030-02-10 Sun	55	—	unknown	03:40–05:50 (good, 2.17 h)	87.1° 09:35	10.44	54%	106.3°
2030-02-11 Mon	56	—	unknown	03:35–05:50 (good, 2.25 h)	87.1° 09:30	10.4	64%	111.2°
2030-02-12 Tue	57	—	unknown	03:40–05:50 (good, 2.17 h)	87.1° 09:25	10.36	72%	115.3°
2030-02-13 Wed	56	—	unknown	03:35–05:45 (good, 2.17 h)	87.1° 09:20	10.32	81%	118.4°
2030-02-14 Thu	57	—	unknown	03:35–05:45 (good, 2.17 h)	87.1° 09:20	10.28	88%	120.2°
2030-02-15 Fri	51	—	unknown	03:30–05:45 (good, 2.25 h)	87.1° 09:15	10.24	94%	120.4°
2030-02-16 Sat	51	—	unknown	03:30–05:45 (good, 2.25 h)	87.1° 09:10	10.2	98%	118.8°
2030-02-17 Sun	48	—	unknown	03:30–05:40 (good, 2.17 h)	87.1° 09:05	10.16	100%	115.5°
2030-02-18 Mon	46	—	unknown	03:30–05:40 (good, 2.17 h)	87.1° 09:00	10.12	99%	110.7°
2030-02-19 Tue	43	—	unknown	03:30–05:40 (good, 2.17 h)	87.1° 09:00	10.08	96%	104.8°
2030-02-20 Wed	41	—	unknown	03:30–05:40 (good, 2.17 h)	87.1° 08:55	10.04	91%	98.0°
2030-02-21 Thu	40	—	unknown	03:25–05:35 (good, 2.17 h)	87.1° 08:50	10.0	83%	90.8°
2030-02-22 Fri	41	—	unknown	03:20–05:35 (good, 2.25 h)	87.1° 08:45	9.95	74%	83.6°
2030-02-23 Sat	44	—	unknown	03:10–05:35 (good, 2.42 h)	87.1° 08:40	9.91	63%	76.7°
2030-02-24 Sun	48	—	unknown	03:00–05:30 (good, 2.5 h)	87.1° 08:40	9.87	52%	70.5°
2030-02-25 Mon	55	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:35	9.82	40%	65.4°
2030-02-26 Tue	62	—	unknown	02:35–05:30 (good, 2.92 h)	87.1° 08:30	9.78	30%	61.7°
2030-02-27 Wed	69	—	unknown	02:30–05:30 (good, 3.0 h)	87.1° 08:25	9.74	20%	59.7°
2030-02-28 Thu	74	—	unknown	02:30–05:25 (good, 2.92 h)	87.1° 08:25	9.69	12%	59.7°
2030-03-01 Fri	77	—	unknown	02:25–05:25 (good, 3.0 h)	87.1° 08:20	9.65	6%	61.4°
2030-03-02 Sat	79	—	unknown	02:20–05:25 (good, 3.08 h)	87.1° 08:15	9.6	2%	64.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-02-01&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.