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: 10-24 (98), 10-25 (97), 10-26 (96), 10-28 (95), 10-27 (94) — by astronomy; check the weather when the night is within four days.

2043-10-24astronomy score per night — click a bar for that night2043-11-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2043-10-24 Sat	98	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:50	10.19	52%	112.9°
2043-10-25 Sun	97	—	unknown	19:00–22:45 (good, 3.75 h)	87.1° 16:45	10.23	41%	111.2°
2043-10-26 Mon	96	—	unknown	19:00–22:40 (good, 3.67 h)	87.1° 16:40	10.27	31%	108.4°
2043-10-27 Tue	94	—	unknown	19:00–22:35 (good, 3.58 h)	87.1° 16:35	10.31	22%	104.7°
2043-10-28 Wed	95	—	unknown	18:55–22:30 (good, 3.58 h)	87.1° 16:30	10.35	14%	100.4°
2043-10-29 Thu	93	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:30	10.39	8%	95.7°
2043-10-30 Fri	92	—	unknown	18:55–22:25 (good, 3.5 h)	87.1° 16:25	10.42	3%	90.9°
2043-10-31 Sat	90	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.46	1%	86.1°
2043-11-01 Sun	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.5	0%	81.5°
2043-11-02 Mon	88	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.53	1%	77.3°
2043-11-03 Tue	86	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.57	4%	73.5°
2043-11-04 Wed	85	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.6	8%	70.5°
2043-11-05 Thu	81	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.64	14%	68.2°
2043-11-06 Fri	75	—	unknown	18:45–21:55 (good, 3.17 h)	87.1° 15:55	10.67	22%	66.9°
2043-11-07 Sat	68	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:55	10.71	30%	66.6°
2043-11-08 Sun	59	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:50	10.74	39%	67.4°
2043-11-09 Mon	52	—	unknown	18:45–21:25 (good, 2.67 h)	87.1° 15:45	10.77	49%	69.4°
2043-11-10 Tue	45	—	unknown	18:45–21:15 (good, 2.5 h)	87.1° 15:40	10.8	59%	72.4°
2043-11-11 Wed	41	—	unknown	18:45–20:55 (good, 2.17 h)	87.1° 15:35	10.84	69%	76.3°
2043-11-12 Thu	38	—	unknown	18:40–20:20 (good, 1.67 h)	87.1° 15:35	10.87	79%	81.1°
2043-11-13 Fri	36	—	unknown	18:40–20:05 (good, 1.42 h)	87.1° 15:30	10.9	87%	86.5°
2043-11-14 Sat	36	—	unknown	18:40–20:10 (good, 1.5 h)	87.1° 15:25	10.93	94%	92.3°
2043-11-15 Sun	39	—	unknown	18:40–20:30 (good, 1.83 h)	87.1° 15:20	10.96	98%	98.1°
2043-11-16 Mon	42	—	unknown	18:40–20:50 (good, 2.17 h)	87.1° 15:15	10.98	100%	103.5°
2043-11-17 Tue	46	—	unknown	18:40–20:50 (good, 2.17 h)	87.1° 15:15	11.01	98%	108.1°
2043-11-18 Wed	49	—	unknown	18:40–20:55 (good, 2.25 h)	87.1° 15:10	11.04	94%	111.4°
2043-11-19 Thu	58	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 15:05	11.07	87%	113.2°
2043-11-20 Fri	60	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 15:00	11.09	78%	113.4°
2043-11-21 Sat	59	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 15:00	11.12	68%	112.0°
2043-11-22 Sun	57	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.14	57%	109.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2043-10-24&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.