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: 10-21 (100), 10-22 (100), 10-20 (99), 10-24 (99), 10-23 (98) — by astronomy; check the weather when the night is within four days.

2046-10-07astronomy score per night — click a bar for that night2046-11-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-10-07 Sun	70	—	unknown	20:25–00:35 (good, 4.17 h)	87.1° 18:55	9.47	61%	62.8°
2046-10-08 Mon	59	—	unknown	20:25–00:20 (good, 3.92 h)	87.1° 18:50	9.52	70%	63.7°
2046-10-09 Tue	52	—	unknown	20:25–22:55 (good, 2.5 h)	87.1° 18:45	9.56	78%	65.9°
2046-10-10 Wed	48	—	unknown	20:20–22:05 (good, 1.75 h)	87.1° 18:40	9.61	86%	69.1°
2046-10-11 Thu	46	—	unknown	20:20–21:50 (good, 1.5 h)	87.1° 18:40	9.65	92%	73.2°
2046-10-12 Fri	46	—	unknown	20:20–21:50 (good, 1.5 h)	87.1° 18:35	9.7	96%	77.9°
2046-10-13 Sat	49	—	unknown	20:20–22:05 (good, 1.75 h)	87.1° 18:30	9.74	99%	83.0°
2046-10-14 Sun	54	—	unknown	20:15–22:30 (good, 2.25 h)	87.1° 18:25	9.78	100%	88.3°
2046-10-15 Mon	61	—	unknown	20:15–23:00 (good, 2.75 h)	87.1° 18:20	9.83	99%	93.8°
2046-10-16 Tue	67	—	unknown	20:15–23:35 (good, 3.33 h)	87.1° 18:20	9.87	96%	99.2°
2046-10-17 Wed	75	—	unknown	20:10–23:50 (good, 3.67 h)	87.1° 18:15	9.91	92%	104.3°
2046-10-18 Thu	91	—	unknown	20:10–23:50 (good, 3.67 h)	87.1° 18:10	9.96	86%	108.9°
2046-10-19 Fri	96	—	unknown	20:10–23:55 (good, 3.75 h)	87.1° 18:05	10.0	78%	112.7°
2046-10-20 Sat	99	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 18:05	10.04	70%	115.6°
2046-10-21 Sun	100	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 18:00	10.08	60%	117.2°
2046-10-22 Mon	100	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 17:55	10.12	49%	117.3°
2046-10-23 Tue	98	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:50	10.16	38%	115.7°
2046-10-24 Wed	99	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:45	10.2	28%	112.5°
2046-10-25 Thu	97	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:45	10.24	18%	107.9°
2046-10-26 Fri	96	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.28	10%	102.1°
2046-10-27 Sat	94	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:35	10.32	4%	95.5°
2046-10-28 Sun	93	—	unknown	18:55–22:30 (good, 3.58 h)	87.1° 16:30	10.36	1%	88.5°
2046-10-29 Mon	92	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:25	10.4	0%	81.7°
2046-10-30 Tue	91	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:25	10.43	3%	75.4°
2046-10-31 Wed	90	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.47	8%	70.1°
2046-11-01 Thu	85	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.51	16%	66.0°
2046-11-02 Fri	77	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.54	25%	63.5°
2046-11-03 Sat	68	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:10	10.58	34%	62.5°
2046-11-04 Sun	58	—	unknown	18:50–21:50 (good, 3.0 h)	87.1° 16:05	10.61	44%	63.0°
2046-11-05 Mon	50	—	unknown	18:50–21:35 (good, 2.75 h)	87.1° 16:00	10.65	54%	64.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-10-07&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.