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: 03-22 (38), 03-19 (37), 03-20 (37), 03-21 (37), 03-23 (37) — by astronomy; check the weather when the night is within four days.

2032-03-05astronomy score per night — click a bar for that night2032-04-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-03-20 Sat	37	—	unknown	03:25–04:50 (good, 1.42 h)	71.1° 08:25	8.69	69%	140.4°
2032-03-21 Sun	37	—	unknown	03:25–04:50 (good, 1.42 h)	71.1° 08:20	8.64	78%	142.8°
2032-03-22 Mon	38	—	unknown	03:25–04:50 (good, 1.42 h)	71.1° 08:20	8.59	85%	142.2°
2032-03-23 Tue	37	—	unknown	03:20–04:45 (good, 1.42 h)	71.1° 08:15	8.54	91%	138.5°
2032-03-24 Wed	34	—	unknown	03:20–04:45 (good, 1.42 h)	71.1° 08:10	8.48	96%	132.5°
2032-03-25 Thu	33	—	unknown	03:15–04:40 (good, 1.42 h)	71.1° 08:05	8.43	99%	124.8°
2032-03-26 Fri	32	—	unknown	03:15–04:40 (good, 1.42 h)	71.1° 08:00	8.38	100%	116.0°
2032-03-27 Sat	29	—	unknown	04:15–05:40 (good, 1.42 h)	71.1° 09:00	8.32	99%	106.4°
2032-03-28 Sun	26	—	unknown	04:20–05:35 (good, 1.25 h)	71.1° 08:55	8.27	96%	96.4°
2032-03-29 Mon	24	—	unknown	04:40–05:35 (good, 0.92 h)	71.1° 08:50	8.22	92%	86.1°
2032-03-30 Tue	22	—	unknown	04:55–05:30 (good, 0.58 h)	71.1° 08:45	8.16	85%	75.7°
2032-03-31 Wed	22	—	unknown	05:00–05:30 (good, 0.5 h)	71.1° 08:45	8.11	76%	65.5°
2032-04-01 Thu	24	—	unknown	04:35–05:30 (good, 0.92 h)	71.1° 08:40	8.05	66%	55.7°
2032-04-02 Fri	26	—	unknown	04:00–05:25 (good, 1.42 h)	71.1° 08:35	8.0	56%	47.0°
2032-04-03 Sat	32	—	unknown	03:45–05:25 (good, 1.67 h)	71.1° 08:30	7.94	44%	40.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-05&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.