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: 06-02 (100), 06-03 (100), 06-04 (100), 06-05 (100), 06-06 (100) — by astronomy; check the weather when the night is within four days.

2032-05-26astronomy score per night — click a bar for that night2032-06-24

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-26 Wed	32	—	unknown	23:45–03:50 (marginal, 4.08 h)	71.1° 05:00	5.01	96%	51.4°
2032-05-27 Thu	32	—	unknown	23:40–03:50 (marginal, 4.17 h)	71.1° 05:00	4.97	90%	43.3°
2032-05-28 Fri	39	—	unknown	23:25–03:50 (marginal, 4.42 h)	71.1° 04:55	4.93	82%	38.1°
2032-05-29 Sat	63	—	unknown	23:50–03:50 (good, 4.0 h)	71.1° 04:50	4.89	72%	37.2°
2032-05-30 Sun	76	—	unknown	23:45–03:45 (good, 4.0 h)	71.1° 04:45	4.85	61%	40.8°
2032-05-31 Mon	89	—	unknown	23:40–03:45 (good, 4.08 h)	71.1° 04:45	4.81	49%	47.9°
2032-06-01 Tue	96	—	unknown	23:40–03:45 (good, 4.08 h)	71.1° 04:40	4.78	38%	56.9°
2032-06-02 Wed	100	—	unknown	23:35–03:45 (good, 4.17 h)	71.1° 04:35	4.74	28%	67.1°
2032-06-03 Thu	100	—	unknown	23:30–03:45 (good, 4.25 h)	71.1° 04:30	4.71	18%	77.7°
2032-06-04 Fri	100	—	unknown	23:25–03:40 (good, 4.25 h)	71.1° 04:25	4.68	11%	88.5°
2032-06-05 Sat	100	—	unknown	23:20–03:40 (good, 4.33 h)	71.1° 04:25	4.65	5%	99.1°
2032-06-06 Sun	100	—	unknown	23:20–03:40 (good, 4.33 h)	71.1° 04:20	4.62	1%	109.4°
2032-06-07 Mon	100	—	unknown	23:15–03:40 (good, 4.42 h)	71.1° 04:15	4.59	0%	119.1°
2032-06-08 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 04:10	4.57	1%	127.8°
2032-06-09 Wed	100	—	unknown	23:05–03:40 (good, 4.58 h)	71.1° 04:05	4.54	4%	135.1°
2032-06-10 Thu	100	—	unknown	23:05–03:40 (good, 4.58 h)	71.1° 04:05	4.52	8%	140.4°
2032-06-11 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 04:00	4.5	14%	142.9°
2032-06-12 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:55	4.49	22%	142.1°
2032-06-13 Sun	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:50	4.47	30%	138.3°
2032-06-14 Mon	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:50	4.46	39%	132.3°
2032-06-15 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:45	4.45	48%	124.8°
2032-06-16 Wed	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:40	4.44	58%	116.2°
2032-06-17 Thu	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:35	4.43	67%	106.8°
2032-06-18 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:30	4.43	76%	96.8°
2032-06-19 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	71.1° 03:30	4.42	85%	86.5°
2032-06-20 Sun	73	—	unknown	23:55–03:40 (good, 3.75 h)	71.1° 03:25	4.42	92%	75.8°
2032-06-21 Mon	57	—	unknown	01:05–03:40 (good, 2.58 h)	71.1° 03:20	4.42	97%	65.2°
2032-06-22 Tue	44	—	unknown	23:15–03:40 (marginal, 4.42 h)	71.1° 03:15	4.43	100%	55.0°
2032-06-23 Wed	34	—	unknown	23:15–03:40 (marginal, 4.42 h)	71.1° 03:10	4.43	100%	46.0°
2032-06-24 Thu	31	—	unknown	23:15–03:40 (marginal, 4.42 h)	71.1° 03:10	4.44	97%	39.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-26&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.