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 HD 189733: 06-30 (100), 07-01 (100), 07-02 (100), 07-03 (100), 07-04 (100) — by astronomy; check the weather when the night is within four days.

2032-06-25astronomy score per night — click a bar for that night2032-07-24

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-06-25 Fri	37	—	unknown	23:15–03:40 (marginal, 4.42 h)	71.1° 03:05	4.45	91%	37.1°
2032-06-26 Sat	48	—	unknown	22:20–03:40 (marginal, 5.33 h)	71.1° 03:00	4.46	84%	39.6°
2032-06-27 Sun	86	—	unknown	23:15–03:30 (good, 4.25 h)	71.1° 02:55	4.48	74%	46.0°
2032-06-28 Mon	95	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 02:55	4.49	63%	54.8°
2032-06-29 Tue	99	—	unknown	23:10–03:45 (good, 4.58 h)	71.1° 02:50	4.51	52%	64.9°
2032-06-30 Wed	100	—	unknown	23:10–03:45 (good, 4.58 h)	71.1° 02:45	4.53	41%	75.5°
2032-07-01 Thu	100	—	unknown	23:10–03:45 (good, 4.58 h)	71.1° 02:40	4.55	30%	86.1°
2032-07-02 Fri	100	—	unknown	23:10–03:45 (good, 4.58 h)	71.1° 02:35	4.57	21%	96.7°
2032-07-03 Sat	100	—	unknown	23:10–03:45 (good, 4.58 h)	71.1° 02:35	4.6	13%	106.9°
2032-07-04 Sun	100	—	unknown	23:10–03:45 (good, 4.58 h)	71.1° 02:30	4.63	7%	116.6°
2032-07-05 Mon	100	—	unknown	23:10–03:50 (good, 4.67 h)	71.1° 02:25	4.65	3%	125.5°
2032-07-06 Tue	100	—	unknown	23:10–03:50 (good, 4.67 h)	71.1° 02:20	4.68	1%	133.2°
2032-07-07 Wed	100	—	unknown	23:05–03:50 (good, 4.75 h)	71.1° 02:15	4.72	0%	139.1°
2032-07-08 Thu	100	—	unknown	23:05–03:50 (good, 4.75 h)	71.1° 02:15	4.75	2%	142.4°
2032-07-09 Fri	100	—	unknown	23:05–03:55 (good, 4.83 h)	71.1° 02:10	4.78	5%	142.5°
2032-07-10 Sat	100	—	unknown	23:05–03:55 (good, 4.83 h)	71.1° 02:05	4.82	10%	139.5°
2032-07-11 Sun	100	—	unknown	23:05–03:55 (good, 4.83 h)	71.1° 02:00	4.86	16%	134.1°
2032-07-12 Mon	100	—	unknown	23:05–03:55 (good, 4.83 h)	71.1° 02:00	4.9	24%	127.0°
2032-07-13 Tue	100	—	unknown	23:00–04:00 (good, 5.0 h)	71.1° 01:55	4.94	32%	118.8°
2032-07-14 Wed	100	—	unknown	23:00–04:00 (good, 5.0 h)	71.1° 01:50	4.98	42%	109.7°
2032-07-15 Thu	100	—	unknown	23:00–04:00 (good, 5.0 h)	71.1° 01:45	5.02	52%	100.1°
2032-07-16 Fri	100	—	unknown	23:00–04:00 (good, 5.0 h)	71.1° 01:40	5.07	62%	90.1°
2032-07-17 Sat	100	—	unknown	22:55–04:05 (good, 5.17 h)	71.1° 01:40	5.11	72%	79.8°
2032-07-18 Sun	100	—	unknown	22:55–04:05 (good, 5.17 h)	71.1° 01:35	5.16	81%	69.4°
2032-07-19 Mon	100	—	unknown	23:15–04:05 (good, 4.83 h)	71.1° 01:30	5.2	89%	59.1°
2032-07-20 Tue	58	—	unknown	02:35–04:10 (good, 1.58 h)	71.1° 01:25	5.25	95%	49.5°
2032-07-21 Wed	41	—	unknown	22:50–04:10 (marginal, 5.33 h)	71.1° 01:20	5.3	99%	41.8°
2032-07-22 Thu	33	—	unknown	22:50–04:10 (marginal, 5.33 h)	71.1° 01:20	5.35	100%	37.6°
2032-07-23 Fri	36	—	unknown	22:50–04:10 (marginal, 5.33 h)	71.1° 01:15	5.4	98%	38.2°
2032-07-24 Sat	48	—	unknown	22:45–04:15 (marginal, 5.5 h)	71.1° 01:10	5.45	93%	43.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-25&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.