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: 03-23 (100), 03-24 (100), 03-25 (100), 03-26 (100), 03-27 (100) — by astronomy; check the weather when the night is within four days.

2036-02-29astronomy score per night — click a bar for that night2036-03-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-02-29 Fri	77	—	unknown	02:25–05:25 (good, 3.0 h)	87.1° 08:20	9.67	7%	91.9°
2036-03-01 Sat	78	—	unknown	02:20–05:25 (good, 3.08 h)	87.1° 08:15	9.62	14%	98.6°
2036-03-02 Sun	79	—	unknown	02:20–05:20 (good, 3.0 h)	87.1° 08:15	9.57	22%	105.1°
2036-03-03 Mon	80	—	unknown	02:15–05:20 (good, 3.08 h)	87.1° 08:10	9.53	31%	111.1°
2036-03-04 Tue	82	—	unknown	02:10–05:20 (good, 3.17 h)	87.1° 08:05	9.48	42%	116.1°
2036-03-05 Wed	83	—	unknown	02:05–05:20 (good, 3.25 h)	87.1° 08:00	9.44	53%	119.8°
2036-03-06 Thu	83	—	unknown	02:10–05:15 (good, 3.08 h)	87.1° 07:55	9.39	64%	121.7°
2036-03-07 Fri	83	—	unknown	02:05–05:15 (good, 3.17 h)	87.1° 07:55	9.34	75%	121.5°
2036-03-08 Sat	81	—	unknown	02:05–05:15 (good, 3.17 h)	87.1° 07:50	9.29	84%	119.1°
2036-03-09 Sun	70	—	unknown	02:05–05:10 (good, 3.08 h)	87.1° 07:45	9.24	92%	114.7°
2036-03-10 Mon	64	—	unknown	02:10–05:10 (good, 3.0 h)	87.1° 07:40	9.2	97%	108.7°
2036-03-11 Tue	56	—	unknown	02:15–05:05 (good, 2.83 h)	87.1° 07:35	9.15	100%	101.8°
2036-03-12 Wed	50	—	unknown	02:50–05:05 (good, 2.25 h)	87.1° 07:35	9.1	100%	94.4°
2036-03-13 Thu	45	—	unknown	03:15–05:05 (good, 1.83 h)	87.1° 07:30	9.05	97%	86.9°
2036-03-14 Fri	42	—	unknown	03:30–05:00 (good, 1.5 h)	87.1° 07:25	9.0	92%	79.8°
2036-03-15 Sat	43	—	unknown	03:25–05:00 (good, 1.58 h)	87.1° 07:20	8.95	85%	73.3°
2036-03-16 Sun	45	—	unknown	02:50–05:00 (good, 2.17 h)	87.1° 07:20	8.9	77%	67.7°
2036-03-17 Mon	49	—	unknown	01:50–04:55 (good, 3.08 h)	87.1° 07:15	8.85	68%	63.2°
2036-03-18 Tue	57	—	unknown	01:35–04:55 (good, 3.33 h)	87.1° 07:10	8.8	58%	60.1°
2036-03-19 Wed	68	—	unknown	01:10–04:55 (good, 3.75 h)	87.1° 07:05	8.74	48%	58.4°
2036-03-20 Thu	78	—	unknown	01:10–04:50 (good, 3.67 h)	87.1° 07:00	8.69	39%	58.2°
2036-03-21 Fri	89	—	unknown	01:05–04:50 (good, 3.75 h)	87.1° 07:00	8.64	30%	59.6°
2036-03-22 Sat	96	—	unknown	01:00–04:45 (good, 3.75 h)	87.1° 06:55	8.59	22%	62.3°
2036-03-23 Sun	100	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:50	8.54	14%	66.2°
2036-03-24 Mon	100	—	unknown	00:50–04:45 (good, 3.92 h)	87.1° 06:45	8.48	8%	71.2°
2036-03-25 Tue	100	—	unknown	00:50–04:40 (good, 3.83 h)	87.1° 06:40	8.43	4%	76.9°
2036-03-26 Wed	100	—	unknown	00:45–04:40 (good, 3.92 h)	87.1° 06:40	8.38	1%	83.2°
2036-03-27 Thu	100	—	unknown	00:40–04:40 (good, 4.0 h)	87.1° 06:35	8.32	0%	89.9°
2036-03-28 Fri	100	—	unknown	00:35–04:35 (good, 4.0 h)	87.1° 06:30	8.27	1%	96.7°
2036-03-29 Sat	100	—	unknown	00:30–05:35 (good, 4.08 h)	87.1° 07:25	8.21	5%	103.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-02-29&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.