Cagayan Valley · Philippines · 16.73° N · 121.36° E
Solar position in Diadi
Sun position, daylight and the best solar panel angle for Diadi — computed for 16.73° N, 121.36° E, 276 m above sea level.
The sun right now
Sun in Diadi today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:37 | sun 18° below horizon |
| Nautical dawn | 05:02 | 12° below |
| Civil dawn | 05:27 | 6° below |
| Sunrise | 05:49 | 102° ESE |
| Golden hour ends | 06:19 | sun 6° up |
| Solar noon | 11:38 | 61.2° high |
| Golden hour starts | 16:58 | sun 6° up |
| Sunset | 17:27 | 258° WSW |
| Civil dusk | 17:49 | 6° below |
| Nautical dusk | 18:14 | 12° below |
| Astronomical dusk | 18:40 | 18° below |
| Day length | 11 h 38 min | |
Sun path diagram for Diadi
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 83.3° at solar noon in Diadi; on the December solstice only 49.9°. Sunrise swings from 65° ENE in June to 114° ESE in December — a 49° 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 | 06:27 | 12:05 | 17:44 | 11 h 18 min | 53.4° |
| February | 06:17 | 12:08 | 17:58 | 11 h 41 min | 62.7° |
| March | 05:58 | 12:01 | 18:05 | 12 h 07 min | 73.5° |
| April | 05:35 | 11:53 | 18:11 | 12 h 36 min | 85.1° |
| May | 05:22 | 11:51 | 18:20 | 12 h 58 min | 86.6° |
| June | 05:22 | 11:56 | 18:30 | 13 h 08 min | 83.3° |
| July | 05:31 | 12:01 | 18:30 | 12 h 59 min | 86.3° |
| August | 05:39 | 11:57 | 18:15 | 12 h 37 min | 85.4° |
| September | 05:43 | 11:47 | 17:51 | 12 h 08 min | 74.0° |
| October | 05:48 | 11:39 | 17:29 | 11 h 41 min | 62.6° |
| November | 06:01 | 11:40 | 17:19 | 11 h 18 min | 53.4° |
| December | 06:18 | 11:52 | 17:26 | 11 h 08 min | 49.9° |
A year of daylight in Diadi
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 Diadi
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
13°collects the most energy over a year: 1440 kWh per kWp.
37°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° | 1410 | 98% | 2.61 | 1.9× |
| 13° year-round best | 1440 | 100% | 2.95 | 1.6× |
| 15° | 1440 | 100% | 2.99 | 1.6× |
| 17° = latitude | 1438 | 100% | 3.03 | 1.6× |
| 30° | 1391 | 97% | 3.21 | 1.4× |
| 37° off-grid best | 1342 | 93% | 3.24 | 1.3× |
| 45° | 1266 | 88% | 3.24 | 1.4× |
| 60° | 1076 | 75% | 3.09 | 1.7× |
| 70° | 922 | 64% | 2.90 | 2.2× |
| 90° | 623 | 43% | 2.30 | 2.5× |
A fixed array in Diadi produces the most over a year at 13°. The design month for an off-grid system is December: at 37° it makes 3.24 kWh per kWp a day, 10% more than at 13°, and costs 7% of the yearly total. Why steep panels win winter.
Off-grid solar in Diadi at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 13° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 13° | Mean temp. |
|---|---|---|---|---|---|
| January | 3.78 | 3.96 | 3.29 | 3.41 | 21.7 °C |
| February | 4.55 | 4.06 | 3.36 | 3.98 | 22.4 °C |
| March | 5.36 | 3.76 | 3.09 | 4.47 | 24.0 °C |
| April | 6.10 | 3.02 | 2.44 | 4.82 | 26.0 °C |
| May | 6.03 | 2.24 | 1.79 | 4.58 | 26.7 °C |
| June | 5.87 | 1.96 | 1.55 | 4.39 | 26.2 °C |
| July | 5.31 | 2.05 | 1.63 | 4.03 | 25.6 °C |
| August | 4.89 | 2.43 | 1.95 | 3.82 | 25.5 °C |
| September | 4.97 | 3.13 | 2.54 | 4.03 | 25.3 °C |
| October | 4.30 | 3.44 | 2.82 | 3.63 | 24.6 °C |
| November | 3.70 | 3.66 | 3.01 | 3.27 | 23.9 °C |
| December | 3.29 | 3.51 | 2.90 | 2.95 | 22.7 °C |
| Year | 4.84 avg | 3.10 avg | 922 kWh | 1440 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 760 Wp of panels at 70°, versus 400 Wp at 13°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Diadi
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.
2.5 mrow pitch at 70°
2.4 mrow pitch at 13°
How Diadi compares in the Philippines
Against the other 519 places in the Philippines with climate data, for a fixed array at its best angle.
447thof 520 places in the Philippines for sunshine, shared: 4.84 peak sun hours a day on flat ground.
−2%solar energy a year compared with the average place in the Philippines: 1,440 against 1,467 kWh per kWp.
+8 mindaylight on the longest day, compared with Quezon City: 13 h 08 min against 13 h 00 min.
13°best year-round tilt here; across the Philippines it runs from 4° in Bongao to 18° in Vigan.
Of the 520 places in the Philippines, Jolo gets the most sun (5.36 peak sun hours a day) and Pangil the least (4.68); Diadi ranks joint 447th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.55 kWh a day here, against 1.34 kWh on average in the Philippines. The shortest day lasts 11 h 08 min, −8 min compared with Quezon City.
Solar forecast for Diadi, 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 Diadi
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Places near Diadi
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A free, live card for Diadi: 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.