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The webapp calculates and displays a monthly or yearly timetable of various celestial events and moon data for a specified location and timezone. Sun-related times: Night End, Nautical Dawn, Civil Dawn, Sunrise, Solar Noon, Sunset, Civil Dusk, Nautical Dusk, and Night. Moon-related data: Moonrise, Moonset, Moon Illumination (percentage), Moon Phase (e.g., New Moon, Full Moon, Waxing Crescent), and Moon Distance (in kilometers).

Users can input their latitude, longitude, and timezone (hours from UTC) to get accurate calculations for their specific location. It also attempts to use the browser’s geolocation to auto-detect the user’s position. When time is displayed as NaN or “–“, this means the object does not reach the specific sun angle or does not rise all day.

Different types of twilight, which are defined by the sun’s angle below the horizon. Here’s a summary of these twilight phases:

Civil Twilight (C.Twi): This is the brightest phase of twilight. It occurs when the geometric center of the sun is 6 degrees below the horizon. During this period, there is enough natural light for most outdoor activities without artificial illumination, and only the brightest stars and planets are visible. The horizon is clearly discernible.

Nautical Twilight (N.Twi): This phase is darker than civil twilight. It occurs when the geometric center of the sun is 12 degrees below the horizon. During nautical twilight, the horizon may still be faintly visible, and many brighter stars become apparent, historically allowing sailors to use them for navigation. Artificial light is generally required for outdoor activities.

Astronomical Twilight (A.Twi): This is the full night, it occurs when the geometric center of the sun is 18 degrees below the horizon. During astronomical twilight, the sky illumination diminishes. The horizon is no longer discernible, and fainter stars and celestial objects can be observed, especially in areas without light pollution. At this point, there is no indirect sunlight, and the sky is at its darkest, allowing for all astronomical observations.