East Kalimantan · Indonesia · 0.97° S · 116.71° E
Solar position in Nusantara
Sun position, daylight and the best solar panel angle for Nusantara — computed for 0.97° S, 116.71° E, 48 m above sea level.
The sun right now
Sun in Nusantara today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:42 | sun 18° below horizon |
| Nautical dawn | 05:07 | 12° below |
| Civil dawn | 05:31 | 6° below |
| Sunrise | 05:53 | 102° ESE |
| Golden hour ends | 06:21 | sun 6° up |
| Solar noon | 11:57 | 78.9° high |
| Golden hour starts | 17:33 | sun 6° up |
| Sunset | 18:01 | 258° WSW |
| Civil dusk | 18:22 | 6° below |
| Nautical dusk | 18:47 | 12° below |
| Astronomical dusk | 19:11 | 18° below |
| Day length | 12 h 08 min | |
Sun path diagram for Nusantara
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 65.6° at solar noon in Nusantara; on the December solstice only 67.5°. Sunrise swings from 67° ENE in June to 113° 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 | 06:19 | 12:24 | 18:29 | 12 h 10 min | 71.1° |
| February | 06:22 | 12:26 | 18:30 | 12 h 08 min | 80.4° |
| March | 06:17 | 12:20 | 18:23 | 12 h 06 min | 88.8° |
| April | 06:09 | 12:11 | 18:14 | 12 h 05 min | 77.2° |
| May | 06:07 | 12:09 | 18:11 | 12 h 04 min | 68.9° |
| June | 06:12 | 12:14 | 18:16 | 12 h 04 min | 65.6° |
| July | 06:17 | 12:19 | 18:21 | 12 h 04 min | 68.6° |
| August | 06:13 | 12:16 | 18:18 | 12 h 05 min | 76.9° |
| September | 06:03 | 12:06 | 18:09 | 12 h 06 min | 88.3° |
| October | 05:53 | 11:57 | 18:01 | 12 h 08 min | 80.3° |
| November | 05:53 | 11:58 | 18:03 | 12 h 10 min | 71.1° |
| December | 06:05 | 12:11 | 18:16 | 12 h 11 min | 67.5° |
A year of daylight in Nusantara
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 Nusantara
Fixed array facing north (azimuth 0°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
3°collects the most energy over a year: 1373 kWh per kWp.
3°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° | 1371 | 100% | 3.58 | 1.1× |
| 1° = latitude | 1372 | 100% | 3.57 | 1.1× |
| 3° year-round best off-grid best | 1373 | 100% | 3.53 | 1.1× |
| 15° | 1349 | 98% | 3.23 | 1.2× |
| 30° | 1256 | 92% | 2.71 | 1.5× |
| 45° | 1100 | 80% | 2.07 | 1.8× |
| 60° | 895 | 65% | 1.43 | 2.3× |
| 70° | 755 | 55% | 1.26 | 2.5× |
| 90° | 519 | 38% | 1.10 | 1.9× |
A fixed array in Nusantara produces the most over a year at 3°. The design month for an off-grid system is December: at 3° it makes 3.53 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Nusantara at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 3° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 3° | Mean temp. |
|---|---|---|---|---|---|
| January | 4.54 | 1.60 | 1.26 | 3.54 | 26.2 °C |
| February | 4.97 | 1.78 | 1.41 | 3.91 | 26.2 °C |
| March | 4.97 | 2.37 | 1.90 | 3.94 | 26.4 °C |
| April | 4.88 | 3.07 | 2.48 | 3.90 | 26.7 °C |
| May | 4.67 | 3.55 | 2.88 | 3.75 | 26.7 °C |
| June | 4.38 | 3.61 | 2.94 | 3.53 | 26.2 °C |
| July | 4.59 | 3.67 | 2.99 | 3.70 | 25.9 °C |
| August | 4.90 | 3.37 | 2.74 | 3.94 | 25.9 °C |
| September | 4.99 | 2.68 | 2.16 | 3.98 | 26.2 °C |
| October | 4.82 | 1.95 | 1.55 | 3.80 | 26.6 °C |
| November | 4.65 | 1.56 | 1.22 | 3.63 | 26.7 °C |
| December | 4.54 | 1.60 | 1.26 | 3.53 | 26.4 °C |
| Year | 4.74 avg | 2.57 avg | 755 kWh | 1373 kWh |
Sizing example. To run a 1 kWh-per-day load through November on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 970 Wp of panels at 70°, versus 330 Wp at 3°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Nusantara
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.
1.7 mrow pitch at 70°
2.1 mrow pitch at 3°
How Nusantara compares in Indonesia
Against the other 446 places in Indonesia with climate data, for a fixed array at its best angle.
398thof 447 places in Indonesia for sunshine, shared: 4.74 peak sun hours a day on flat ground.
−8%solar energy a year compared with the average place in Indonesia: 1,373 against 1,498 kWh per kWp.
−18 mindaylight on the longest day, compared with Jakarta: 12 h 11 min against 12 h 29 min.
3°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); Nusantara ranks joint 398th. In its darkest month, November, 1 kWp of off-grid panels at 70° makes 1.22 kWh a day here, against 1.26 kWh on average in Indonesia. The shortest day lasts 12 h 04 min, +18 min compared with Jakarta.
Solar forecast for Nusantara, 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 Nusantara
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A free, live card for Nusantara: 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.