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: 10-28 (92), 10-27 (91), 10-29 (91), 10-30 (91), 10-26 (89) — by astronomy; check the weather when the night is within four days.

2029-10-19astronomy score per night — click a bar for that night2029-11-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-10-19 Fri	43	—	unknown	20:10–21:30 (good, 1.33 h)	87.1° 18:05	10.0	94%	78.2°
2029-10-20 Sat	47	—	unknown	20:05–21:45 (good, 1.67 h)	87.1° 18:00	10.05	98%	84.0°
2029-10-21 Sun	51	—	unknown	20:05–22:10 (good, 2.08 h)	87.1° 18:00	10.09	100%	89.9°
2029-10-22 Mon	57	—	unknown	20:05–22:45 (good, 2.67 h)	87.1° 17:55	10.13	100%	95.8°
2029-10-23 Tue	63	—	unknown	20:05–23:20 (good, 3.25 h)	87.1° 17:50	10.17	98%	101.6°
2029-10-24 Wed	71	—	unknown	20:00–23:20 (good, 3.33 h)	87.1° 17:45	10.21	94%	106.9°
2029-10-25 Thu	86	—	unknown	20:00–23:25 (good, 3.42 h)	87.1° 17:40	10.25	89%	111.7°
2029-10-26 Fri	89	—	unknown	20:00–23:25 (good, 3.42 h)	87.1° 17:40	10.29	83%	115.7°
2029-10-27 Sat	91	—	unknown	20:00–23:25 (good, 3.42 h)	87.1° 17:35	10.32	75%	118.5°
2029-10-28 Sun	92	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:30	10.36	66%	120.1°
2029-10-29 Mon	91	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:25	10.4	56%	120.1°
2029-10-30 Tue	91	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.44	45%	118.4°
2029-10-31 Wed	89	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.48	35%	115.1°
2029-11-01 Thu	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.51	25%	110.2°
2029-11-02 Fri	87	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.55	15%	104.2°
2029-11-03 Sat	86	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.58	8%	97.1°
2029-11-04 Sun	84	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:05	10.62	3%	89.6°
2029-11-05 Mon	82	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.65	0%	82.0°
2029-11-06 Tue	81	—	unknown	18:45–21:55 (good, 3.17 h)	87.1° 15:55	10.69	1%	74.8°
2029-11-07 Wed	79	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:50	10.72	4%	68.6°
2029-11-08 Thu	77	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:45	10.75	11%	63.7°
2029-11-09 Fri	69	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:45	10.79	19%	60.7°
2029-11-10 Sat	61	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.82	28%	59.7°
2029-11-11 Sun	52	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:35	10.85	39%	60.5°
2029-11-12 Mon	45	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:30	10.88	49%	62.9°
2029-11-13 Tue	39	—	unknown	18:40–20:55 (good, 2.25 h)	87.1° 15:25	10.91	59%	66.7°
2029-11-14 Wed	35	—	unknown	18:40–20:05 (good, 1.42 h)	87.1° 15:25	10.94	68%	71.4°
2029-11-15 Thu	32	—	unknown	18:40–19:40 (good, 1.0 h)	87.1° 15:20	10.97	77%	76.7°
2029-11-16 Fri	31	—	unknown	18:40–19:35 (good, 0.92 h)	87.1° 15:15	11.0	84%	82.4°
2029-11-17 Sat	31	—	unknown	18:40–19:40 (good, 1.0 h)	87.1° 15:10	11.02	91%	88.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-10-19&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.