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: 10-25 (97), 10-26 (96), 10-27 (94), 10-28 (93), 10-29 (92) — by astronomy; check the weather when the night is within four days.

2038-10-25astronomy score per night — click a bar for that night2038-11-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2038-10-25 Mon	97	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:45	10.24	8%	92.3°
2038-10-26 Tue	96	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.28	3%	85.4°
2038-10-27 Wed	94	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:35	10.32	0%	78.6°
2038-10-28 Thu	93	—	unknown	19:55–23:30 (good, 3.58 h)	87.1° 17:30	10.36	1%	72.5°
2038-10-29 Fri	92	—	unknown	19:55–23:25 (good, 3.5 h)	87.1° 17:25	10.39	5%	67.5°
2038-10-30 Sat	90	—	unknown	19:55–23:25 (good, 3.5 h)	87.1° 17:25	10.43	11%	64.1°
2038-10-31 Sun	82	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.47	20%	62.5°
2038-11-01 Mon	75	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.5	29%	62.8°
2038-11-02 Tue	65	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.54	40%	64.8°
2038-11-03 Wed	57	—	unknown	18:50–21:50 (good, 3.0 h)	87.1° 16:10	10.58	50%	68.1°
2038-11-04 Thu	51	—	unknown	18:50–21:40 (good, 2.83 h)	87.1° 16:05	10.61	60%	72.4°
2038-11-05 Fri	46	—	unknown	18:50–21:30 (good, 2.67 h)	87.1° 16:00	10.65	70%	77.3°
2038-11-06 Sat	45	—	unknown	18:45–21:05 (good, 2.33 h)	87.1° 15:55	10.68	79%	82.7°
2038-11-07 Sun	44	—	unknown	18:45–20:55 (good, 2.17 h)	87.1° 15:50	10.71	86%	88.2°
2038-11-08 Mon	44	—	unknown	18:45–20:55 (good, 2.17 h)	87.1° 15:50	10.75	92%	93.7°
2038-11-09 Tue	46	—	unknown	18:45–21:05 (good, 2.33 h)	87.1° 15:45	10.78	96%	99.1°
2038-11-10 Wed	48	—	unknown	18:45–21:10 (good, 2.42 h)	87.1° 15:40	10.81	99%	104.1°
2038-11-11 Thu	51	—	unknown	18:45–21:10 (good, 2.42 h)	87.1° 15:35	10.84	100%	108.6°
2038-11-12 Fri	55	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:30	10.87	99%	112.4°
2038-11-13 Sat	56	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:30	10.9	96%	115.2°
2038-11-14 Sun	64	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:25	10.93	92%	117.0°
2038-11-15 Mon	64	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:20	10.96	86%	117.5°
2038-11-16 Tue	64	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:15	10.99	79%	116.6°
2038-11-17 Wed	64	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.02	70%	114.4°
2038-11-18 Thu	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.04	60%	111.0°
2038-11-19 Fri	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.07	50%	106.4°
2038-11-20 Sat	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.1	39%	101.0°
2038-11-21 Sun	59	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.12	29%	94.8°
2038-11-22 Mon	58	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:55	11.15	19%	88.2°
2038-11-23 Tue	56	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.17	10%	81.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2038-10-25&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.