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: 10-22 (100), 10-24 (99), 10-23 (98), 10-25 (97), 10-26 (96) — by astronomy; check the weather when the night is within four days.

2046-10-22astronomy score per night — click a bar for that night2046-11-20

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2046-11-06 Tue	44	—	unknown	18:45–21:20 (good, 2.58 h)	87.1° 15:55	10.68	63%	67.9°
2046-11-07 Wed	39	—	unknown	18:45–20:25 (good, 1.67 h)	87.1° 15:50	10.72	72%	71.8°
2046-11-08 Thu	36	—	unknown	18:45–19:55 (good, 1.17 h)	87.1° 15:50	10.75	80%	76.4°
2046-11-09 Fri	35	—	unknown	18:45–19:50 (good, 1.08 h)	87.1° 15:45	10.78	87%	81.4°
2046-11-10 Sat	36	—	unknown	18:45–19:55 (good, 1.17 h)	87.1° 15:40	10.81	93%	86.8°
2046-11-11 Sun	37	—	unknown	18:45–20:10 (good, 1.42 h)	87.1° 15:35	10.84	97%	92.3°
2046-11-12 Mon	42	—	unknown	18:40–20:35 (good, 1.92 h)	87.1° 15:30	10.87	99%	97.8°
2046-11-13 Tue	45	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:30	10.91	100%	103.1°
2046-11-14 Wed	49	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:25	10.93	98%	107.9°
2046-11-15 Thu	52	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:20	10.96	95%	112.1°
2046-11-16 Fri	61	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:15	10.99	90%	115.2°
2046-11-17 Sat	62	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:10	11.02	83%	117.2°
2046-11-18 Sun	62	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.05	74%	117.6°
2046-11-19 Mon	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.07	64%	116.5°
2046-11-20 Tue	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.1	54%	113.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-10-22&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.