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: 02-17 (63), 02-18 (63), 02-16 (62), 02-15 (60), 02-13 (58) — by astronomy; check the weather when the night is within four days.

2032-01-20astronomy score per night — click a bar for that night2032-02-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-02-10 Tue	54	—	unknown	03:40–05:50 (good, 2.17 h)	87.1° 09:35	10.46	0%	61.5°
2032-02-11 Wed	55	—	unknown	03:35–05:50 (good, 2.25 h)	87.1° 09:30	10.42	1%	66.8°
2032-02-12 Thu	57	—	unknown	03:35–05:50 (good, 2.25 h)	87.1° 09:25	10.38	4%	73.5°
2032-02-13 Fri	58	—	unknown	03:30–05:50 (good, 2.33 h)	87.1° 09:25	10.34	10%	80.9°
2032-02-14 Sat	58	—	unknown	03:25–05:45 (good, 2.33 h)	87.1° 09:20	10.3	18%	88.6°
2032-02-15 Sun	60	—	unknown	03:20–05:45 (good, 2.42 h)	87.1° 09:15	10.26	28%	96.0°
2032-02-16 Mon	62	—	unknown	03:15–05:45 (good, 2.5 h)	87.1° 09:10	10.22	38%	103.0°
2032-02-17 Tue	63	—	unknown	03:15–05:45 (good, 2.5 h)	87.1° 09:10	10.18	48%	109.3°
2032-02-18 Wed	63	—	unknown	03:10–05:40 (good, 2.5 h)	87.1° 09:05	10.14	58%	114.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-20&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.