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: 11-28 (47), 11-27 (46), 11-29 (46), 11-30 (44), 12-01 (43) — by astronomy; check the weather when the night is within four days.

2034-11-18astronomy score per night — click a bar for that night2034-12-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-11-18 Sat	40	—	unknown	18:40–20:45 (good, 2.08 h)	87.1° 15:10	11.04	47%	66.0°
2034-11-19 Sun	36	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 15:05	11.07	58%	71.6°
2034-11-20 Mon	33	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 15:00	11.1	68%	78.2°
2034-11-21 Tue	32	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:55	11.12	78%	85.6°
2034-11-22 Wed	32	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:55	11.15	87%	93.4°
2034-11-23 Thu	34	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:50	11.17	94%	101.2°
2034-11-24 Fri	37	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:45	11.19	98%	108.7°
2034-11-25 Sat	40	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:40	11.21	100%	115.1°
2034-11-26 Sun	42	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:35	11.24	98%	119.9°
2034-11-27 Mon	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:35	11.26	94%	122.5°
2034-11-28 Tue	47	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:30	11.28	87%	122.7°
2034-11-29 Wed	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	78%	120.4°
2034-11-30 Thu	44	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.31	68%	116.4°
2034-12-01 Fri	43	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.33	58%	111.1°
2034-12-02 Sat	42	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.35	48%	105.0°
2034-12-03 Sun	40	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.36	38%	98.5°
2034-12-04 Mon	38	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:05	11.38	28%	91.9°
2034-12-05 Tue	37	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.39	20%	85.4°
2034-12-06 Wed	36	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:00	11.41	13%	79.0°
2034-12-07 Thu	34	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.42	8%	73.1°
2034-12-08 Fri	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.43	3%	67.8°
2034-12-09 Sat	31	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.44	1%	63.2°
2034-12-10 Sun	30	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.45	0%	59.8°
2034-12-11 Mon	29	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:40	11.46	1%	57.8°
2034-12-12 Tue	27	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:35	11.47	4%	57.2°
2034-12-13 Wed	25	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	9%	58.3°
2034-12-14 Thu	22	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:25	11.49	15%	60.9°
2034-12-15 Fri	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:20	11.49	22%	65.0°
2034-12-16 Sat	18	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:20	11.5	31%	70.3°
2034-12-17 Sun	16	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 13:15	11.5	41%	76.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-11-18&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.