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: 11-16 (82), 11-17 (80), 11-18 (78), 11-19 (77), 11-20 (75) — by astronomy; check the weather when the night is within four days.

2033-11-16astronomy score per night — click a bar for that night2033-12-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-11-16 Wed	82	—	unknown	18:40–21:45 (good, 3.08 h)	71.1° 16:40	11.0	22%	119.2°
2033-11-17 Thu	80	—	unknown	18:40–21:40 (good, 3.0 h)	71.1° 16:35	11.02	15%	110.5°
2033-11-18 Fri	78	—	unknown	18:40–21:40 (good, 3.0 h)	71.1° 16:30	11.05	9%	101.3°
2033-11-19 Sat	77	—	unknown	18:35–21:35 (good, 3.0 h)	71.1° 16:30	11.08	4%	92.0°
2033-11-20 Sun	75	—	unknown	18:35–21:30 (good, 2.92 h)	71.1° 16:25	11.1	1%	82.5°
2033-11-21 Mon	74	—	unknown	18:35–21:25 (good, 2.83 h)	71.1° 16:20	11.13	0%	73.1°
2033-11-22 Tue	72	—	unknown	18:35–21:20 (good, 2.75 h)	71.1° 16:15	11.15	1%	63.9°
2033-11-23 Wed	70	—	unknown	18:35–21:20 (good, 2.75 h)	71.1° 16:10	11.17	4%	55.2°
2033-11-24 Thu	66	—	unknown	18:35–21:15 (good, 2.67 h)	71.1° 16:10	11.2	8%	47.4°
2033-11-25 Fri	60	—	unknown	18:35–21:10 (good, 2.58 h)	71.1° 16:05	11.22	14%	41.3°
2033-11-26 Sat	52	—	unknown	18:35–21:05 (good, 2.5 h)	71.1° 16:00	11.24	22%	38.0°
2033-11-27 Sun	44	—	unknown	18:35–20:50 (good, 2.25 h)	71.1° 15:55	11.26	32%	38.3°
2033-11-28 Mon	36	—	unknown	18:35–20:35 (good, 2.0 h)	71.1° 15:50	11.28	42%	42.4°
2033-11-29 Tue	30	—	unknown	18:35–19:55 (good, 1.33 h)	71.1° 15:50	11.3	53%	49.4°
2033-11-30 Wed	26	—	unknown	18:35–19:05 (good, 0.5 h)	71.1° 15:45	11.32	64%	58.6°
2033-12-01 Thu	25	—	unknown	18:35–18:55 (good, 0.33 h)	71.1° 15:40	11.34	75%	69.1°
2033-12-02 Fri	25	—	unknown	18:35–19:05 (good, 0.5 h)	71.1° 15:35	11.35	84%	80.3°
2033-12-03 Sat	28	—	unknown	18:35–19:40 (good, 1.08 h)	71.1° 15:30	11.37	92%	92.0°
2033-12-04 Sun	32	—	unknown	18:35–20:10 (good, 1.58 h)	71.1° 15:30	11.38	97%	103.7°
2033-12-05 Mon	37	—	unknown	18:35–20:15 (good, 1.67 h)	71.1° 15:25	11.4	100%	114.9°
2033-12-06 Tue	39	—	unknown	18:35–20:15 (good, 1.67 h)	71.1° 15:20	11.41	99%	125.2°
2033-12-07 Wed	39	—	unknown	18:35–20:15 (good, 1.67 h)	71.1° 15:15	11.42	96%	133.8°
2033-12-08 Thu	43	—	unknown	18:35–20:10 (good, 1.58 h)	71.1° 15:15	11.44	91%	139.8°
2033-12-09 Fri	42	—	unknown	18:35–20:15 (good, 1.67 h)	71.1° 15:10	11.45	84%	142.3°
2033-12-10 Sat	41	—	unknown	18:35–20:10 (good, 1.58 h)	71.1° 15:05	11.46	76%	140.8°
2033-12-11 Sun	40	—	unknown	18:35–20:05 (good, 1.5 h)	71.1° 15:00	11.47	66%	136.2°
2033-12-12 Mon	38	—	unknown	18:35–20:05 (good, 1.5 h)	71.1° 14:55	11.47	57%	129.5°
2033-12-13 Tue	36	—	unknown	18:35–20:00 (good, 1.42 h)	71.1° 14:55	11.48	47%	121.6°
2033-12-14 Wed	35	—	unknown	18:35–19:55 (good, 1.33 h)	71.1° 14:50	11.49	38%	113.0°
2033-12-15 Thu	34	—	unknown	18:35–19:50 (good, 1.25 h)	71.1° 14:45	11.49	29%	103.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-16&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.