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 (99), 10-22 (99), 10-23 (99), 10-24 (99), 10-20 (97) — by astronomy; check the weather when the night is within four days.

2035-10-14astronomy score per night — click a bar for that night2035-11-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-10-14 Sun	52	—	unknown	20:15–22:25 (good, 2.17 h)	87.1° 18:25	9.77	94%	81.6°
2035-10-15 Mon	56	—	unknown	20:15–22:45 (good, 2.5 h)	87.1° 18:25	9.81	98%	88.6°
2035-10-16 Tue	62	—	unknown	20:15–23:15 (good, 3.0 h)	87.1° 18:20	9.86	100%	95.9°
2035-10-17 Wed	70	—	unknown	20:10–23:45 (good, 3.58 h)	87.1° 18:15	9.9	99%	103.1°
2035-10-18 Thu	78	—	unknown	20:10–23:50 (good, 3.67 h)	87.1° 18:10	9.94	96%	109.8°
2035-10-19 Fri	94	—	unknown	20:10–23:50 (good, 3.67 h)	87.1° 18:05	9.98	90%	115.5°
2035-10-20 Sat	97	—	unknown	20:10–23:55 (good, 3.75 h)	87.1° 18:05	10.03	82%	119.7°
2035-10-21 Sun	99	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 18:00	10.07	72%	122.0°
2035-10-22 Mon	99	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:55	10.11	61%	122.0°
2035-10-23 Tue	99	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:50	10.15	50%	119.9°
2035-10-24 Wed	99	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:50	10.19	38%	115.9°
2035-10-25 Thu	97	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:45	10.23	28%	110.6°
2035-10-26 Fri	96	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.27	19%	104.3°
2035-10-27 Sat	94	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:35	10.31	11%	97.5°
2035-10-28 Sun	95	—	unknown	18:55–22:30 (good, 3.58 h)	87.1° 16:30	10.35	5%	90.4°
2035-10-29 Mon	93	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:30	10.38	2%	83.5°
2035-10-30 Tue	91	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:25	10.42	0%	76.9°
2035-10-31 Wed	90	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.46	1%	71.0°
2035-11-01 Thu	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.49	3%	65.9°
2035-11-02 Fri	86	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.53	8%	61.9°
2035-11-03 Sat	81	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.57	14%	59.2°
2035-11-04 Sun	75	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.6	21%	57.9°
2035-11-05 Mon	67	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.64	29%	58.2°
2035-11-06 Tue	60	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:55	10.67	38%	60.0°
2035-11-07 Wed	53	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:55	10.7	47%	63.2°
2035-11-08 Thu	47	—	unknown	18:45–21:25 (good, 2.67 h)	87.1° 15:50	10.74	56%	67.5°
2035-11-09 Fri	42	—	unknown	18:45–21:10 (good, 2.42 h)	87.1° 15:45	10.77	66%	72.9°
2035-11-10 Sat	40	—	unknown	18:45–20:40 (good, 1.92 h)	87.1° 15:40	10.8	75%	79.0°
2035-11-11 Sun	39	—	unknown	18:45–20:30 (good, 1.75 h)	87.1° 15:35	10.83	84%	85.8°
2035-11-12 Mon	41	—	unknown	18:40–20:35 (good, 1.92 h)	87.1° 15:35	10.86	91%	92.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-10-14&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.