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: 10-06 (100), 10-07 (100), 10-08 (100), 10-09 (100), 10-10 (100) — by astronomy; check the weather when the night is within four days.

2034-10-06astronomy score per night — click a bar for that night2034-11-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-06 Fri	100	—	unknown	20:30–00:55 (good, 4.42 h)	87.1° 19:00	9.42	27%	118.8°
2034-10-07 Sat	100	—	unknown	20:30–00:55 (good, 4.42 h)	87.1° 18:55	9.47	18%	114.2°
2034-10-08 Sun	100	—	unknown	20:25–00:50 (good, 4.42 h)	87.1° 18:50	9.51	11%	108.5°
2034-10-09 Mon	100	—	unknown	20:25–00:45 (good, 4.33 h)	87.1° 18:45	9.56	6%	102.2°
2034-10-10 Tue	100	—	unknown	20:25–00:40 (good, 4.25 h)	87.1° 18:40	9.6	2%	95.6°
2034-10-11 Wed	100	—	unknown	20:20–00:35 (good, 4.25 h)	87.1° 18:40	9.65	0%	88.9°
2034-10-12 Thu	100	—	unknown	20:20–00:35 (good, 4.25 h)	87.1° 18:35	9.69	0%	82.3°
2034-10-13 Fri	100	—	unknown	20:20–00:30 (good, 4.17 h)	87.1° 18:30	9.74	2%	76.0°
2034-10-14 Sat	100	—	unknown	20:15–00:25 (good, 4.17 h)	87.1° 18:25	9.78	6%	70.3°
2034-10-15 Sun	100	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:20	9.82	12%	65.3°
2034-10-16 Mon	97	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:20	9.87	18%	61.2°
2034-10-17 Tue	92	—	unknown	20:10–00:15 (good, 4.08 h)	87.1° 18:15	9.91	26%	58.4°
2034-10-18 Wed	81	—	unknown	20:10–00:10 (good, 4.0 h)	87.1° 18:10	9.95	35%	57.0°
2034-10-19 Thu	71	—	unknown	20:10–00:05 (good, 3.92 h)	87.1° 18:05	9.99	44%	57.2°
2034-10-20 Fri	61	—	unknown	20:05–23:40 (good, 3.58 h)	87.1° 18:05	10.04	54%	59.1°
2034-10-21 Sat	53	—	unknown	20:05–23:30 (good, 3.42 h)	87.1° 18:00	10.08	64%	62.6°
2034-10-22 Sun	48	—	unknown	20:05–22:25 (good, 2.33 h)	87.1° 17:55	10.12	74%	67.6°
2034-10-23 Mon	45	—	unknown	20:05–21:50 (good, 1.75 h)	87.1° 17:50	10.16	83%	73.8°
2034-10-24 Tue	47	—	unknown	20:00–21:50 (good, 1.83 h)	87.1° 17:45	10.2	90%	81.0°
2034-10-25 Wed	50	—	unknown	20:00–22:10 (good, 2.17 h)	87.1° 17:45	10.24	96%	88.9°
2034-10-26 Thu	56	—	unknown	20:00–22:40 (good, 2.67 h)	87.1° 17:40	10.28	99%	96.9°
2034-10-27 Fri	63	—	unknown	20:00–23:05 (good, 3.08 h)	87.1° 17:35	10.32	100%	104.8°
2034-10-28 Sat	71	—	unknown	19:55–23:10 (good, 3.25 h)	87.1° 17:30	10.35	97%	111.9°
2034-10-29 Sun	85	—	unknown	18:55–22:15 (good, 3.33 h)	87.1° 16:25	10.39	91%	117.6°
2034-10-30 Mon	87	—	unknown	18:55–22:15 (good, 3.33 h)	87.1° 16:25	10.43	84%	121.5°
2034-10-31 Tue	88	—	unknown	18:55–22:10 (good, 3.25 h)	87.1° 16:20	10.47	74%	123.0°
2034-11-01 Wed	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.5	63%	122.3°
2034-11-02 Thu	87	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.54	52%	119.5°
2034-11-03 Fri	86	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:10	10.58	42%	115.2°
2034-11-04 Sat	84	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.61	32%	109.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-06&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.