Central Java · Indonesia · 6.70° S · 111.34° E
Solar position in Rembangan
Sun position, daylight and the best solar panel angle for Rembangan — computed for 6.70° S, 111.34° E, 11 m above sea level.
The sun right now
Sun in Rembangan today
Sunday, 25 October 2026 · local time UTC+7
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 03:58 | sun 18° below horizon |
| Nautical dawn | 04:23 | 12° below |
| Civil dawn | 04:48 | 6° below |
| Sunrise | 05:09 | 102° ESE |
| Golden hour ends | 05:37 | sun 6° up |
| Solar noon | 11:18 | 84.6° high |
| Golden hour starts | 16:59 | sun 6° up |
| Sunset | 17:27 | 258° WSW |
| Civil dusk | 17:49 | 6° below |
| Nautical dusk | 18:14 | 12° below |
| Astronomical dusk | 18:39 | 18° below |
| Day length | 12 h 18 min | |
Sun path diagram for Rembangan
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 59.9° at solar noon in Rembangan; on the December solstice only 73.3°. Sunrise swings from 66° ENE in June to 114° ESE in December — a 47° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 05:32 | 11:45 | 17:59 | 12 h 27 min | 76.8° |
| February | 05:39 | 11:48 | 17:56 | 12 h 17 min | 86.1° |
| March | 05:38 | 11:41 | 17:44 | 12 h 06 min | 83.1° |
| April | 05:35 | 11:33 | 17:31 | 11 h 55 min | 71.4° |
| May | 05:37 | 11:31 | 17:24 | 11 h 47 min | 63.1° |
| June | 05:44 | 11:36 | 17:28 | 11 h 44 min | 59.9° |
| July | 05:47 | 11:41 | 17:34 | 11 h 47 min | 62.8° |
| August | 05:40 | 11:37 | 17:35 | 11 h 55 min | 71.2° |
| September | 05:24 | 11:27 | 17:30 | 12 h 06 min | 82.6° |
| October | 05:10 | 11:19 | 17:27 | 12 h 17 min | 86.0° |
| November | 05:07 | 11:20 | 17:33 | 12 h 27 min | 76.8° |
| December | 05:17 | 11:32 | 17:48 | 12 h 31 min | 73.3° |
A year of daylight in Rembangan
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Rembangan
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
10°collects the most energy over a year: 1518 kWh per kWp.
0°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° off-grid best | 1501 | 99% | 3.59 | 1.4× |
| 7° = latitude | 1517 | 100% | 3.48 | 1.4× |
| 10° year-round best | 1518 | 100% | 3.42 | 1.5× |
| 15° | 1513 | 100% | 3.30 | 1.5× |
| 30° | 1443 | 95% | 2.85 | 1.7× |
| 45° | 1296 | 85% | 2.27 | 2.0× |
| 60° | 1083 | 71% | 1.63 | 2.6× |
| 70° | 918 | 60% | 1.29 | 3.0× |
| 90° | 622 | 41% | 1.12 | 2.6× |
A fixed array in Rembangan produces the most over a year at 10°. The design month for an off-grid system is December: at 0° it makes 3.59 kWh per kWp a day, 5% more than at 10°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Rembangan at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 10° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 10° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.63 | 1.65 | 1.29 | 3.48 | 27.0 °C |
| February | 4.84 | 2.02 | 1.60 | 3.72 | 26.9 °C |
| March | 5.20 | 2.76 | 2.22 | 4.10 | 27.2 °C |
| April | 5.13 | 3.56 | 2.88 | 4.18 | 27.6 °C |
| May | 4.93 | 4.19 | 3.40 | 4.13 | 27.7 °C |
| June | 4.81 | 4.55 | 3.70 | 4.11 | 27.2 °C |
| July | 5.13 | 4.70 | 3.83 | 4.37 | 26.8 °C |
| August | 5.76 | 4.47 | 3.64 | 4.80 | 27.0 °C |
| September | 6.18 | 3.58 | 2.89 | 4.96 | 27.7 °C |
| October | 5.96 | 2.46 | 1.96 | 4.61 | 28.2 °C |
| November | 5.33 | 1.81 | 1.42 | 4.02 | 28.0 °C |
| December | 4.56 | 1.65 | 1.29 | 3.42 | 27.4 °C |
| Year | 5.20 avg | 3.12 avg | 918 kWh | 1518 kWh |
Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 910 Wp of panels at 70°, versus 350 Wp at 10°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Rembangan
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
1.9 mrow pitch at 70°
2.2 mrow pitch at 10°
How Rembangan compares in Indonesia
Against the other 446 places in Indonesia with climate data, for a fixed array at its best angle.
180thof 447 places in Indonesia for sunshine, shared: 5.21 peak sun hours a day on flat ground.
+1%solar energy a year compared with the average place in Indonesia: 1,518 against 1,498 kWh per kWp.
+2 mindaylight on the longest day, compared with Jakarta: 12 h 31 min against 12 h 29 min.
10°best year-round tilt here; across Indonesia it runs from 0° in Batam to 12° in Kupang.
Of the 447 places in Indonesia, Lewoleba gets the most sun (5.95 peak sun hours a day) and Kuala Tungkal the least (4.48); Rembangan ranks joint 180th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.29 kWh a day here, against 1.26 kWh on average in Indonesia. The shortest day lasts 11 h 44 min, −2 min compared with Jakarta.
Solar forecast for Rembangan, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Rembangan
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Places near Rembangan
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A free, live card for Rembangan: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.