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 HD 189733: 03-19 (37), 03-18 (36), 03-16 (34), 03-17 (34), 03-15 (33) — by astronomy; check the weather when the night is within four days.

2032-02-19astronomy score per night — click a bar for that night2032-03-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-19 Thu	12	—	unknown	05:25–05:40 (good, 0.25 h)	71.1° 10:25	10.1	67%	122.4°
2032-02-20 Fri	14	—	unknown	05:20–05:40 (good, 0.33 h)	71.1° 10:20	10.06	76%	130.3°
2032-02-21 Sat	14	—	unknown	05:15–05:35 (good, 0.33 h)	71.1° 10:15	10.02	84%	136.8°
2032-02-22 Sun	15	—	unknown	05:10–05:35 (good, 0.42 h)	71.1° 10:10	9.98	90%	141.2°
2032-02-23 Mon	14	—	unknown	05:15–05:35 (good, 0.33 h)	71.1° 10:10	9.93	95%	142.8°
2032-02-24 Tue	15	—	unknown	05:10–05:35 (good, 0.42 h)	71.1° 10:05	9.89	98%	141.3°
2032-02-25 Wed	15	—	unknown	05:10–05:30 (good, 0.33 h)	71.1° 10:00	9.85	100%	136.9°
2032-02-26 Thu	15	—	unknown	05:05–05:30 (good, 0.42 h)	71.1° 09:55	9.8	100%	130.4°
2032-02-27 Fri	16	—	unknown	05:00–05:30 (good, 0.5 h)	71.1° 09:50	9.76	98%	122.4°
2032-02-28 Sat	15	—	unknown	05:00–05:25 (good, 0.42 h)	71.1° 09:50	9.71	94%	113.5°
2032-02-29 Sun	15	—	unknown	05:00–05:25 (good, 0.42 h)	71.1° 09:45	9.67	88%	103.9°
2032-03-01 Mon	14	—	unknown	05:00–05:25 (good, 0.42 h)	71.1° 09:40	9.62	81%	94.0°
2032-03-02 Tue	13	—	unknown	05:00–05:20 (good, 0.33 h)	71.1° 09:35	9.58	72%	83.7°
2032-03-03 Wed	14	—	unknown	04:55–05:20 (good, 0.42 h)	71.1° 09:35	9.53	62%	73.4°
2032-03-04 Thu	15	—	unknown	04:50–05:20 (good, 0.5 h)	71.1° 09:30	9.48	52%	63.2°
2032-03-05 Fri	18	—	unknown	04:40–05:20 (good, 0.67 h)	71.1° 09:25	9.44	40%	53.6°
2032-03-06 Sat	20	—	unknown	04:30–05:15 (good, 0.75 h)	71.1° 09:20	9.39	30%	45.1°
2032-03-07 Sun	23	—	unknown	04:20–05:15 (good, 0.92 h)	71.1° 09:15	9.34	20%	39.1°
2032-03-08 Mon	27	—	unknown	04:10–05:15 (good, 1.08 h)	71.1° 09:15	9.29	11%	37.1°
2032-03-09 Tue	28	—	unknown	04:10–05:10 (good, 1.0 h)	71.1° 09:10	9.25	5%	40.1°
2032-03-10 Wed	29	—	unknown	04:05–05:10 (good, 1.08 h)	71.1° 09:05	9.2	1%	47.1°
2032-03-11 Thu	29	—	unknown	04:00–05:05 (good, 1.08 h)	71.1° 09:00	9.15	0%	56.7°
2032-03-12 Fri	30	—	unknown	03:55–05:05 (good, 1.17 h)	71.1° 08:55	9.1	2%	67.4°
2032-03-13 Sat	31	—	unknown	03:50–05:05 (good, 1.25 h)	71.1° 08:55	9.05	7%	78.5°
2032-03-14 Sun	32	—	unknown	03:50–05:00 (good, 1.17 h)	71.1° 08:50	9.0	14%	89.6°
2032-03-15 Mon	33	—	unknown	03:45–05:00 (good, 1.25 h)	71.1° 08:45	8.95	22%	100.3°
2032-03-16 Tue	34	—	unknown	03:40–05:00 (good, 1.33 h)	71.1° 08:40	8.9	31%	110.4°
2032-03-17 Wed	34	—	unknown	03:35–04:55 (good, 1.33 h)	71.1° 08:40	8.85	41%	119.8°
2032-03-18 Thu	36	—	unknown	03:30–04:55 (good, 1.42 h)	71.1° 08:35	8.8	51%	128.2°
2032-03-19 Fri	37	—	unknown	03:30–04:55 (good, 1.42 h)	71.1° 08:30	8.75	60%	135.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-19&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.