Astronomical terms related to the position of the Sun and Moon. Data is computed locally using the suncalc-php library, not from the IPMA API.
Solar Twilight Phases
| Term |
Description |
| Astronomical dawn |
Sun at −18° (sky completely dark before sunrise) |
| Nautical dawn |
Sun at −12° (horizon just visible) |
| Civil dawn |
Sun at −6° (enough light for outdoor work) |
| Sunrise |
Upper limb touches horizon |
| Sunrise end |
Lower limb clears horizon (full disc visible) |
| Golden hour end |
Sun below 6° (warm, low-angle light) |
| Solar noon |
Sun at highest altitude for the day |
| Sunset |
Upper limb touches horizon at dusk |
| Sunset start |
Lower limb clears horizon (full disc set) |
| Golden hour start |
Sun below 6° (warm, low-angle light) |
| Civil dusk |
Sun at −6° (enough light for outdoor work) |
| Nautical dusk |
Sun at −12° (horizon just visible) |
| Astronomical dusk |
Sun at −18° (sky completely dark after sunset) |
| Nadir |
Sun at its lowest point (directly below) |
| Day length |
Interval from sunrise to sunset |
Sun Position
| Term |
Description |
| Azimuth |
Compass bearing (0° = North, 90° = East, etc.) |
| Altitude |
Angle above the horizon (negative = below horizon) |
Moon Phases (Numeric Range 0–1)
| Phase |
Range |
| New moon |
0–0.125 |
| Waxing crescent |
0.125–0.25 |
| First quarter |
0.25–0.375 |
| Waxing gibbous |
0.375–0.5 |
| Full moon |
0.5–0.625 |
| Waning gibbous |
0.625–0.75 |
| Last quarter |
0.75–0.875 |
| Waning crescent |
0.875–1 |
Additional Moon Data
| Term |
Description |
| Moonrise |
Time of Moon's appearance above the horizon |
| Moonset |
Time of Moon's disappearance below the horizon |
| Illumination |
Percentage of lunar surface illuminated |
| Distance |
Distance of the Moon in kilometres |
| Azimuth (Moon) |
Compass bearing of the Moon (0° = North, 90° = East, etc.) |
| Altitude (Moon) |
Angle of the Moon above the horizon |
Planet Parameters
Data for the seven classical planets (Mercury through Neptune). Calculated locally using simplified astronomical algorithms.
| Parameter |
Description |
| RA (Right Ascension) |
Equatorial coordinate analogous to longitude, measured in hours (0–24h) |
| Dec (Declination) |
Equatorial coordinate analogous to latitude (−90° to +90°) |
| Azimuth |
Compass bearing (0° = North, 90° = East, 180° = South, 270° = West) |
| Altitude |
Angle above horizon; positive = visible, negative = below horizon |
| Magnitude |
Apparent brightness; lower numbers are brighter (Venus ~−4, Neptune ~+8) |
| Elongation |
Angular separation from the Sun (0° = behind Sun, 180° = opposite) |
| Distance |
Distance from Earth in astronomical units (AU) and kilometres |