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: 11-14 (64), 11-15 (64), 11-16 (64), 11-17 (64), 11-18 (63) — by astronomy; check the weather when the night is within four days.

2038-11-07astronomy score per night — click a bar for that night2038-12-06

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2038-11-24 Wed	54	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.19	4%	75.2°
2038-11-25 Thu	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.21	1%	69.7°
2038-11-26 Fri	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	0%	65.5°
2038-11-27 Sat	50	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.26	3%	63.1°
2038-11-28 Sun	47	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.28	8%	62.6°
2038-11-29 Mon	42	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	15%	64.0°
2038-11-30 Tue	37	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:20	11.31	24%	67.0°
2038-12-01 Wed	34	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:15	11.33	34%	71.1°
2038-12-02 Thu	30	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:15	11.35	44%	76.0°
2038-12-03 Fri	27	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:10	11.37	54%	81.3°
2038-12-04 Sat	24	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:05	11.38	64%	86.9°
2038-12-05 Sun	23	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 14:00	11.39	72%	92.4°
2038-12-06 Mon	22	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 14:00	11.41	80%	97.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2038-11-07&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.