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: 02-09 (52), 02-08 (51), 02-07 (46), 02-06 (41), 02-05 (36) — by astronomy; check the weather when the night is within four days.

2032-01-11astronomy score per night — click a bar for that night2032-02-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-11 Sun	19	—	unknown	05:40–06:10 (good, 0.5 h)	87.1° 11:35	11.31	1%	58.0°
2032-01-12 Mon	20	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:30	11.3	0%	57.4°
2032-01-13 Tue	21	—	unknown	05:30–06:10 (good, 0.67 h)	87.1° 11:25	11.28	2%	59.4°
2032-01-14 Wed	23	—	unknown	05:25–06:10 (good, 0.75 h)	87.1° 11:20	11.26	7%	63.6°
2032-01-15 Thu	24	—	unknown	05:25–06:10 (good, 0.75 h)	87.1° 11:20	11.23	14%	69.5°
2032-01-16 Fri	24	—	unknown	05:20–06:10 (good, 0.83 h)	87.1° 11:15	11.21	23%	76.4°
2032-01-17 Sat	25	—	unknown	05:15–06:10 (good, 0.92 h)	87.1° 11:10	11.19	33%	83.7°
2032-01-18 Sun	27	—	unknown	05:10–06:10 (good, 1.0 h)	87.1° 11:05	11.17	44%	91.0°
2032-01-19 Mon	28	—	unknown	05:10–06:10 (good, 1.0 h)	87.1° 11:00	11.14	55%	98.1°
2032-01-20 Tue	30	—	unknown	05:05–06:10 (good, 1.08 h)	87.1° 11:00	11.12	65%	104.7°
2032-01-21 Wed	30	—	unknown	05:00–06:05 (good, 1.08 h)	87.1° 10:55	11.09	74%	110.5°
2032-01-22 Thu	31	—	unknown	04:55–06:05 (good, 1.17 h)	87.1° 10:50	11.07	82%	115.5°
2032-01-23 Fri	32	—	unknown	05:00–06:05 (good, 1.08 h)	87.1° 10:45	11.04	89%	119.3°
2032-01-24 Sat	32	—	unknown	04:55–06:05 (good, 1.17 h)	87.1° 10:40	11.01	94%	121.7°
2032-01-25 Sun	30	—	unknown	04:55–06:05 (good, 1.17 h)	87.1° 10:40	10.99	98%	122.7°
2032-01-26 Mon	29	—	unknown	04:50–06:05 (good, 1.25 h)	87.1° 10:35	10.96	100%	122.0°
2032-01-27 Tue	30	—	unknown	04:50–06:05 (good, 1.25 h)	87.1° 10:30	10.93	100%	119.9°
2032-01-28 Wed	29	—	unknown	04:50–06:05 (good, 1.25 h)	87.1° 10:25	10.9	98%	116.4°
2032-01-29 Thu	28	—	unknown	04:45–06:00 (good, 1.25 h)	87.1° 10:20	10.87	95%	111.9°
2032-01-30 Fri	27	—	unknown	04:45–06:00 (good, 1.25 h)	87.1° 10:20	10.84	90%	106.5°
2032-01-31 Sat	27	—	unknown	04:45–06:00 (good, 1.25 h)	87.1° 10:15	10.8	83%	100.4°
2032-02-01 Sun	27	—	unknown	04:40–06:00 (good, 1.33 h)	87.1° 10:10	10.77	76%	94.0°
2032-02-02 Mon	28	—	unknown	04:35–06:00 (good, 1.42 h)	87.1° 10:05	10.74	66%	87.2°
2032-02-03 Tue	30	—	unknown	04:30–06:00 (good, 1.5 h)	87.1° 10:05	10.71	57%	80.5°
2032-02-04 Wed	32	—	unknown	04:20–05:55 (good, 1.58 h)	87.1° 10:00	10.67	46%	73.9°
2032-02-05 Thu	36	—	unknown	04:15–05:55 (good, 1.67 h)	87.1° 09:55	10.64	36%	67.7°
2032-02-06 Fri	41	—	unknown	04:05–05:55 (good, 1.83 h)	87.1° 09:50	10.6	25%	62.6°
2032-02-07 Sat	46	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:45	10.57	16%	58.9°
2032-02-08 Sun	51	—	unknown	03:50–05:55 (good, 2.08 h)	87.1° 09:45	10.53	8%	57.3°
2032-02-09 Mon	52	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:40	10.49	3%	58.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-11&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.