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: 10-17 (100), 10-18 (100), 10-19 (100), 10-20 (100), 10-21 (100) — by astronomy; check the weather when the night is within four days.

2033-10-17astronomy score per night — click a bar for that night2033-11-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-10-17 Mon	100	—	unknown	20:10–00:15 (good, 4.08 h)	87.1° 18:15	9.92	24%	114.6°
2033-10-18 Tue	100	—	unknown	20:10–00:10 (good, 4.0 h)	87.1° 18:10	9.96	16%	109.3°
2033-10-19 Wed	100	—	unknown	20:10–00:05 (good, 3.92 h)	87.1° 18:05	10.0	10%	103.4°
2033-10-20 Thu	100	—	unknown	20:05–00:00 (good, 3.92 h)	87.1° 18:00	10.05	5%	97.1°
2033-10-21 Fri	100	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 18:00	10.09	2%	90.6°
2033-10-22 Sat	100	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 17:55	10.13	0%	84.1°
2033-10-23 Sun	98	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:50	10.17	0%	77.7°
2033-10-24 Mon	98	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:45	10.21	2%	71.7°
2033-10-25 Tue	96	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.25	6%	66.4°
2033-10-26 Wed	93	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:40	10.29	12%	61.8°
2033-10-27 Thu	85	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:35	10.33	19%	58.5°
2033-10-28 Fri	78	—	unknown	19:55–23:30 (good, 3.58 h)	87.1° 17:30	10.36	27%	56.7°
2033-10-29 Sat	67	—	unknown	19:55–23:25 (good, 3.5 h)	87.1° 17:25	10.4	37%	56.7°
2033-10-30 Sun	58	—	unknown	18:55–22:05 (good, 3.17 h)	87.1° 16:20	10.44	47%	58.6°
2033-10-31 Mon	50	—	unknown	18:55–21:50 (good, 2.92 h)	87.1° 16:20	10.48	58%	62.4°
2033-11-01 Tue	45	—	unknown	18:50–21:05 (good, 2.25 h)	87.1° 16:15	10.51	69%	67.8°
2033-11-02 Wed	41	—	unknown	18:50–20:25 (good, 1.58 h)	87.1° 16:10	10.55	79%	74.5°
2033-11-03 Thu	41	—	unknown	18:50–20:20 (good, 1.5 h)	87.1° 16:05	10.58	88%	82.1°
2033-11-04 Fri	44	—	unknown	18:50–20:40 (good, 1.83 h)	87.1° 16:05	10.62	94%	90.3°
2033-11-05 Sat	48	—	unknown	18:50–21:10 (good, 2.33 h)	87.1° 16:00	10.65	99%	98.6°
2033-11-06 Sun	55	—	unknown	18:45–21:30 (good, 2.75 h)	87.1° 15:55	10.69	100%	106.5°
2033-11-07 Mon	60	—	unknown	18:45–21:30 (good, 2.75 h)	87.1° 15:50	10.72	98%	113.3°
2033-11-08 Tue	72	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:45	10.75	94%	118.7°
2033-11-09 Wed	73	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:45	10.79	87%	122.2°
2033-11-10 Thu	73	—	unknown	18:45–21:30 (good, 2.75 h)	87.1° 15:40	10.82	79%	123.4°
2033-11-11 Fri	74	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.85	69%	122.6°
2033-11-12 Sat	72	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.88	59%	119.9°
2033-11-13 Sun	71	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.91	49%	115.8°
2033-11-14 Mon	69	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.94	40%	110.7°
2033-11-15 Tue	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.97	30%	104.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-10-17&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.