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.

2034-03-09astronomy score per night — click a bar for that night2034-04-07

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-03-09 Thu	43	—	unknown	03:15–05:10 (good, 1.92 h)	87.1° 07:45	9.27	80%	74.3°
2034-03-10 Fri	45	—	unknown	02:35–05:10 (good, 2.58 h)	87.1° 07:45	9.22	72%	68.7°
2034-03-11 Sat	50	—	unknown	02:10–05:10 (good, 3.0 h)	87.1° 07:40	9.17	63%	63.9°
2034-03-12 Sun	56	—	unknown	02:00–05:05 (good, 3.08 h)	87.1° 07:35	9.12	53%	60.0°
2034-03-13 Mon	65	—	unknown	01:35–05:05 (good, 3.5 h)	87.1° 07:30	9.07	44%	57.5°
2034-03-14 Tue	74	—	unknown	01:35–05:05 (good, 3.5 h)	87.1° 07:30	9.02	34%	56.5°
2034-03-15 Wed	82	—	unknown	01:30–05:00 (good, 3.5 h)	87.1° 07:25	8.97	24%	57.5°
2034-03-16 Thu	90	—	unknown	01:25–05:00 (good, 3.58 h)	87.1° 07:20	8.92	16%	60.4°
2034-03-17 Fri	95	—	unknown	01:20–05:00 (good, 3.67 h)	87.1° 07:15	8.87	8%	65.1°
2034-03-18 Sat	96	—	unknown	01:20–04:55 (good, 3.58 h)	87.1° 07:10	8.82	3%	71.3°
2034-03-19 Sun	97	—	unknown	01:15–04:55 (good, 3.67 h)	87.1° 07:10	8.77	0%	78.6°
2034-03-20 Mon	97	—	unknown	01:10–04:50 (good, 3.67 h)	87.1° 07:05	8.72	0%	86.7°
2034-03-21 Tue	98	—	unknown	01:05–04:50 (good, 3.75 h)	87.1° 07:00	8.67	3%	94.9°
2034-03-22 Wed	99	—	unknown	01:00–04:50 (good, 3.83 h)	87.1° 06:55	8.61	9%	102.9°
2034-03-23 Thu	100	—	unknown	01:00–04:45 (good, 3.75 h)	87.1° 06:50	8.56	17%	110.2°
2034-03-24 Fri	100	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:50	8.51	27%	116.2°
2034-03-25 Sat	100	—	unknown	00:50–05:45 (good, 3.92 h)	87.1° 07:45	8.46	38%	120.6°
2034-03-26 Sun	100	—	unknown	01:50–05:40 (good, 3.83 h)	87.1° 07:40	8.4	49%	123.0°
2034-03-27 Mon	100	—	unknown	01:50–05:40 (good, 3.83 h)	87.1° 07:35	8.35	60%	123.3°
2034-03-28 Tue	100	—	unknown	01:45–05:35 (good, 3.83 h)	87.1° 07:30	8.3	70%	121.7°
2034-03-29 Wed	98	—	unknown	01:45–05:35 (good, 3.83 h)	87.1° 07:30	8.24	79%	118.3°
2034-03-30 Thu	95	—	unknown	01:45–05:35 (good, 3.83 h)	87.1° 07:25	8.19	86%	113.7°
2034-03-31 Fri	80	—	unknown	01:50–05:30 (good, 3.67 h)	87.1° 07:20	8.13	92%	108.1°
2034-04-01 Sat	72	—	unknown	01:50–05:30 (good, 3.67 h)	87.1° 07:15	8.08	97%	101.9°
2034-04-02 Sun	64	—	unknown	02:15–05:25 (good, 3.17 h)	87.1° 07:15	8.02	99%	95.4°
2034-04-03 Mon	57	—	unknown	02:50–05:25 (good, 2.58 h)	87.1° 07:10	7.97	100%	88.8°
2034-04-04 Tue	52	—	unknown	03:15–05:25 (good, 2.17 h)	87.1° 07:05	7.91	99%	82.3°
2034-04-05 Wed	48	—	unknown	03:30–05:20 (good, 1.83 h)	87.1° 07:00	7.86	96%	76.1°
2034-04-06 Thu	48	—	unknown	03:35–05:20 (good, 1.75 h)	87.1° 06:55	7.8	91%	70.3°
2034-04-07 Fri	49	—	unknown	03:10–05:20 (good, 2.17 h)	87.1° 06:55	7.75	85%	65.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-03-09&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.