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: 12-18 (28), 12-19 (27), 12-16 (26), 12-20 (26), 12-15 (25) — by astronomy; check the weather when the night is within four days.

2032-12-14astronomy score per night — click a bar for that night2033-01-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-14 Tue	22	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:50	11.49	96%	107.0°
2032-12-15 Wed	25	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:45	11.49	99%	117.2°
2032-12-16 Thu	26	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:40	11.5	100%	126.5°
2032-12-17 Fri	25	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:35	11.5	99%	134.3°
2032-12-18 Sat	28	—	unknown	18:35–19:30 (good, 0.92 h)	71.1° 14:30	11.5	95%	140.0°
2032-12-19 Sun	27	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:30	11.51	90%	142.7°
2032-12-20 Mon	26	—	unknown	18:35–19:30 (good, 0.92 h)	71.1° 14:25	11.51	84%	141.9°
2032-12-21 Tue	24	—	unknown	18:35–19:25 (good, 0.83 h)	71.1° 14:20	11.51	76%	138.2°
2032-12-22 Wed	23	—	unknown	18:35–19:25 (good, 0.83 h)	71.1° 14:15	11.51	68%	132.1°
2032-12-23 Thu	21	—	unknown	18:40–19:20 (good, 0.67 h)	71.1° 14:15	11.5	59%	124.6°
2032-12-24 Fri	19	—	unknown	18:40–19:15 (good, 0.58 h)	71.1° 14:10	11.5	49%	116.2°
2032-12-25 Sat	19	—	unknown	18:40–19:10 (good, 0.5 h)	71.1° 14:05	11.5	40%	107.1°
2032-12-26 Sun	17	—	unknown	18:40–19:05 (good, 0.42 h)	71.1° 14:00	11.49	31%	97.6°
2032-12-27 Mon	15	—	unknown	18:40–19:05 (good, 0.42 h)	71.1° 13:55	11.49	22%	87.7°
2032-12-28 Tue	13	—	unknown	18:40–19:00 (good, 0.33 h)	71.1° 13:55	11.48	14%	77.5°
2032-12-29 Wed	12	—	unknown	18:40–18:55 (good, 0.25 h)	71.1° 13:50	11.47	8%	67.4°
2032-12-30 Thu	10	—	unknown	18:40–18:50 (good, 0.17 h)	71.1° 13:45	11.47	3%	57.5°
2032-12-31 Fri	8	—	unknown	18:45–18:50 (good, 0.08 h)	71.1° 13:40	11.46	0%	48.5°
2033-01-01 Sat	7	—	unknown	18:10–19:10 (marginal, 1.0 h)	71.1° 13:35	11.45	0%	41.3°
2033-01-02 Sun	6	—	unknown	18:10–18:40 (marginal, 0.5 h)	71.1° 13:35	11.44	3%	37.5°
2033-01-03 Mon	5	—	unknown	18:45–19:05 (marginal, 0.33 h)	71.1° 13:30	11.42	9%	38.3°
2033-01-04 Tue	3	—	unknown	18:45–19:00 (marginal, 0.25 h)	71.1° 13:25	11.41	16%	43.5°
2033-01-05 Wed	2	—	unknown	18:45–18:55 (marginal, 0.17 h)	71.1° 13:20	11.4	26%	51.6°
2033-01-06 Thu	1	—	unknown	—	71.1° 13:20	11.38	36%	61.4°
2033-01-07 Fri	1	—	unknown	—	71.1° 13:15	11.37	48%	72.1°
2033-01-08 Sat	1	—	unknown	—	71.1° 13:10	11.35	59%	83.0°
2033-01-09 Sun	1	—	unknown	—	71.1° 13:05	11.34	69%	93.8°
2033-01-10 Mon	0	—	unknown	—	71.1° 13:00	11.32	79%	104.5°
2033-01-11 Tue	0	—	unknown	—	71.1° 13:00	11.3	87%	114.6°
2033-01-12 Wed	0	—	unknown	—	71.1° 12:55	11.28	93%	124.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-14&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.