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: 03-24 (100), 03-25 (100), 03-26 (100), 03-27 (100), 03-28 (100) — by astronomy; check the weather when the night is within four days.

2044-03-17astronomy score per night — click a bar for that night2044-04-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-03-17 Thu	52	—	unknown	01:55–04:55 (good, 3.0 h)	87.1° 07:15	8.84	83%	79.8°
2044-03-18 Fri	55	—	unknown	01:40–04:55 (good, 3.25 h)	87.1° 07:10	8.79	75%	75.6°
2044-03-19 Sat	61	—	unknown	01:30–04:55 (good, 3.42 h)	87.1° 07:05	8.74	66%	72.0°
2044-03-20 Sun	69	—	unknown	01:10–04:50 (good, 3.67 h)	87.1° 07:00	8.69	57%	69.2°
2044-03-21 Mon	80	—	unknown	01:05–04:50 (good, 3.75 h)	87.1° 07:00	8.64	48%	67.4°
2044-03-22 Tue	89	—	unknown	01:00–04:45 (good, 3.75 h)	87.1° 06:55	8.58	38%	66.5°
2044-03-23 Wed	97	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:50	8.53	29%	66.6°
2044-03-24 Thu	100	—	unknown	00:50–04:45 (good, 3.92 h)	87.1° 06:45	8.48	21%	67.9°
2044-03-25 Fri	100	—	unknown	00:50–04:40 (good, 3.83 h)	87.1° 06:40	8.43	13%	70.4°
2044-03-26 Sat	100	—	unknown	00:45–05:40 (good, 3.92 h)	87.1° 07:40	8.37	7%	73.8°
2044-03-27 Sun	100	—	unknown	01:40–05:40 (good, 4.0 h)	87.1° 07:35	8.32	3%	78.1°
2044-03-28 Mon	100	—	unknown	01:35–05:35 (good, 4.0 h)	87.1° 07:30	8.27	0%	83.2°
2044-03-29 Tue	100	—	unknown	01:30–05:35 (good, 4.08 h)	87.1° 07:25	8.21	0%	88.7°
2044-03-30 Wed	100	—	unknown	01:30–05:30 (good, 4.0 h)	87.1° 07:25	8.16	3%	94.3°
2044-03-31 Thu	100	—	unknown	01:25–05:30 (good, 4.08 h)	87.1° 07:20	8.1	8%	99.8°
2044-04-01 Fri	100	—	unknown	01:20–05:30 (good, 4.17 h)	87.1° 07:15	8.05	16%	104.8°
2044-04-02 Sat	100	—	unknown	01:15–05:25 (good, 4.17 h)	87.1° 07:10	7.99	25%	108.9°
2044-04-03 Sun	100	—	unknown	01:15–05:25 (good, 4.17 h)	87.1° 07:05	7.94	36%	111.9°
2044-04-04 Mon	100	—	unknown	01:15–05:20 (good, 4.08 h)	87.1° 07:05	7.88	47%	113.4°
2044-04-05 Tue	100	—	unknown	01:15–05:20 (good, 4.08 h)	87.1° 07:00	7.83	59%	113.5°
2044-04-06 Wed	100	—	unknown	01:15–05:20 (good, 4.08 h)	87.1° 06:55	7.77	70%	112.1°
2044-04-07 Thu	100	—	unknown	01:15–05:15 (good, 4.0 h)	87.1° 06:50	7.71	79%	109.4°
2044-04-08 Fri	86	—	unknown	01:15–05:15 (good, 4.0 h)	87.1° 06:45	7.66	87%	105.7°
2044-04-09 Sat	79	—	unknown	01:15–05:15 (good, 4.0 h)	87.1° 06:45	7.6	94%	101.3°
2044-04-10 Sun	71	—	unknown	01:30–05:10 (good, 3.67 h)	87.1° 06:40	7.54	98%	96.3°
2044-04-11 Mon	67	—	unknown	01:55–05:10 (good, 3.25 h)	87.1° 06:35	7.49	100%	91.2°
2044-04-12 Tue	62	—	unknown	02:05–05:05 (good, 3.0 h)	87.1° 06:30	7.43	100%	86.2°
2044-04-13 Wed	60	—	unknown	02:05–05:05 (good, 3.0 h)	87.1° 06:30	7.37	98%	81.3°
2044-04-14 Thu	60	—	unknown	01:45–05:05 (good, 3.33 h)	87.1° 06:25	7.31	94%	76.9°
2044-04-15 Fri	61	—	unknown	01:00–05:00 (good, 4.0 h)	87.1° 06:20	7.26	88%	73.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-03-17&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.