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: 10-19 (100), 10-20 (100), 10-21 (100), 10-22 (97), 10-23 (88) — by astronomy; check the weather when the night is within four days.

2036-10-19astronomy score per night — click a bar for that night2036-11-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-10-19 Sun	100	—	unknown	20:10–00:05 (good, 3.92 h)	87.1° 18:05	10.02	0%	77.5°
2036-10-20 Mon	100	—	unknown	20:05–00:00 (good, 3.92 h)	87.1° 18:00	10.06	3%	71.2°
2036-10-21 Tue	100	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 17:55	10.1	7%	66.0°
2036-10-22 Wed	97	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:55	10.14	14%	62.1°
2036-10-23 Thu	88	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:50	10.18	21%	59.8°
2036-10-24 Fri	80	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:45	10.22	30%	59.1°
2036-10-25 Sat	71	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.26	39%	59.9°
2036-10-26 Sun	62	—	unknown	19:00–22:20 (good, 3.33 h)	87.1° 16:35	10.3	49%	62.2°
2036-10-27 Mon	56	—	unknown	18:55–22:10 (good, 3.25 h)	87.1° 16:35	10.34	58%	65.7°
2036-10-28 Tue	51	—	unknown	18:55–22:00 (good, 3.08 h)	87.1° 16:30	10.37	67%	70.1°
2036-10-29 Wed	47	—	unknown	18:55–21:20 (good, 2.42 h)	87.1° 16:25	10.41	76%	75.3°
2036-10-30 Thu	46	—	unknown	18:55–21:00 (good, 2.08 h)	87.1° 16:20	10.45	83%	81.1°
2036-10-31 Fri	47	—	unknown	18:55–21:00 (good, 2.08 h)	87.1° 16:15	10.49	90%	87.3°
2036-11-01 Sat	50	—	unknown	18:50–21:10 (good, 2.33 h)	87.1° 16:15	10.52	95%	93.7°
2036-11-02 Sun	53	—	unknown	18:50–21:30 (good, 2.67 h)	87.1° 16:10	10.56	98%	100.1°
2036-11-03 Mon	57	—	unknown	18:50–21:40 (good, 2.83 h)	87.1° 16:05	10.59	100%	106.2°
2036-11-04 Tue	62	—	unknown	18:50–21:40 (good, 2.83 h)	87.1° 16:00	10.63	99%	111.7°
2036-11-05 Wed	68	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 16:00	10.66	96%	116.3°
2036-11-06 Thu	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:55	10.7	90%	119.4°
2036-11-07 Fri	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:50	10.73	83%	120.8°
2036-11-08 Sat	77	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:45	10.76	73%	120.1°
2036-11-09 Sun	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.79	63%	117.5°
2036-11-10 Mon	74	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:40	10.83	52%	113.2°
2036-11-11 Tue	74	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.86	40%	107.6°
2036-11-12 Wed	72	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.89	29%	101.1°
2036-11-13 Thu	70	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.92	20%	94.1°
2036-11-14 Fri	69	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.95	12%	86.9°
2036-11-15 Sat	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.98	5%	79.9°
2036-11-16 Sun	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	11.0	2%	73.5°
2036-11-17 Mon	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.03	0%	67.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-10-19&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.