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: 02-25 (72), 02-24 (71), 02-23 (69), 02-22 (64), 02-21 (58) — by astronomy; check the weather when the night is within four days.

2036-01-27astronomy score per night — click a bar for that night2036-02-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-01-27 Sun	37	—	unknown	04:35–06:05 (good, 1.5 h)	87.1° 10:30	10.93	0%	60.9°
2036-01-28 Mon	39	—	unknown	04:30–06:05 (good, 1.58 h)	87.1° 10:25	10.9	0%	64.4°
2036-01-29 Tue	40	—	unknown	04:30–06:00 (good, 1.5 h)	87.1° 10:25	10.87	2%	69.0°
2036-01-30 Wed	40	—	unknown	04:25–06:00 (good, 1.58 h)	87.1° 10:20	10.84	6%	74.4°
2036-01-31 Thu	42	—	unknown	04:20–06:00 (good, 1.67 h)	87.1° 10:15	10.8	11%	80.4°
2036-02-01 Fri	44	—	unknown	04:15–06:00 (good, 1.75 h)	87.1° 10:10	10.77	18%	86.8°
2036-02-02 Sat	45	—	unknown	04:10–06:00 (good, 1.83 h)	87.1° 10:05	10.74	26%	93.5°
2036-02-03 Sun	46	—	unknown	04:10–06:00 (good, 1.83 h)	87.1° 10:05	10.7	36%	100.1°
2036-02-04 Mon	46	—	unknown	04:05–05:55 (good, 1.83 h)	87.1° 10:00	10.67	46%	106.6°
2036-02-05 Tue	48	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:55	10.64	57%	112.4°
2036-02-06 Wed	50	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:50	10.6	68%	117.3°
2036-02-07 Thu	50	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:45	10.57	78%	120.6°
2036-02-08 Fri	50	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:45	10.53	87%	121.9°
2036-02-09 Sat	44	—	unknown	03:55–05:50 (good, 1.92 h)	87.1° 09:40	10.49	94%	120.9°
2036-02-10 Sun	43	—	unknown	03:55–05:50 (good, 1.92 h)	87.1° 09:35	10.46	98%	117.5°
2036-02-11 Mon	40	—	unknown	03:55–05:50 (good, 1.92 h)	87.1° 09:30	10.42	100%	112.3°
2036-02-12 Tue	37	—	unknown	04:00–05:50 (good, 1.83 h)	87.1° 09:25	10.38	98%	105.7°
2036-02-13 Wed	34	—	unknown	04:05–05:50 (good, 1.75 h)	87.1° 09:25	10.34	94%	98.4°
2036-02-14 Thu	32	—	unknown	04:20–05:45 (good, 1.42 h)	87.1° 09:20	10.3	88%	91.0°
2036-02-15 Fri	32	—	unknown	04:20–05:45 (good, 1.42 h)	87.1° 09:15	10.26	80%	83.7°
2036-02-16 Sat	34	—	unknown	04:00–05:45 (good, 1.75 h)	87.1° 09:10	10.22	70%	77.0°
2036-02-17 Sun	37	—	unknown	03:40–05:45 (good, 2.08 h)	87.1° 09:10	10.18	60%	71.0°
2036-02-18 Mon	40	—	unknown	03:30–05:40 (good, 2.17 h)	87.1° 09:05	10.14	50%	65.9°
2036-02-19 Tue	46	—	unknown	03:20–05:40 (good, 2.33 h)	87.1° 09:00	10.1	41%	61.9°
2036-02-20 Wed	53	—	unknown	03:00–05:40 (good, 2.67 h)	87.1° 08:55	10.06	32%	59.3°
2036-02-21 Thu	58	—	unknown	03:00–05:35 (good, 2.58 h)	87.1° 08:50	10.02	23%	58.1°
2036-02-22 Fri	64	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:50	9.97	16%	58.4°
2036-02-23 Sat	69	—	unknown	02:50–05:35 (good, 2.75 h)	87.1° 08:45	9.93	10%	60.2°
2036-02-24 Sun	71	—	unknown	02:45–05:35 (good, 2.83 h)	87.1° 08:40	9.89	5%	63.3°
2036-02-25 Mon	72	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:35	9.84	2%	67.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-01-27&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.