Sun Rise & Moon Calculator
The Sun Rise & Moon Calculator is a simple online tool that helps you find important solar and lunar times for a specific location and date. By entering your latitude, longitude, and selected date, you can calculate the approximate sunrise, sunset, moonrise, moonset, and current moon phase.
Whether you're planning outdoor activities, studying astronomy, tracking the Moon, or simply curious about the sky above your location, this calculator provides useful information in just a few seconds.
What Is a Sun Rise & Moon Calculator?
A Sun Rise & Moon Calculator is an online astronomical calculator that estimates when the Sun and Moon will rise and set at a particular geographic location.
The calculator uses three basic inputs:
- Latitude
- Longitude
- Date
Once these values are entered, the calculator provides several results related to the Sun and Moon.
What Does the Calculator Calculate?
The tool provides five main results:
Sunrise
Sunrise is the approximate time when the upper edge of the Sun appears above the eastern horizon.
Sunrise times change throughout the year because of Earth's axial tilt and its orbit around the Sun. Your geographic location also has a major effect on the time of sunrise.
Sunset
Sunset is the approximate time when the Sun disappears below the western horizon.
Like sunrise, sunset varies depending on your latitude, longitude, date, and season. Locations farther north or south can experience significant seasonal differences in daylight duration.
Moonrise
Moonrise is the approximate time when the Moon appears above the horizon.
Unlike the Sun, the Moon does not rise at roughly the same time every day. Its rising time changes considerably from one day to the next because the Moon moves around Earth.
Moonset
Moonset is the approximate time when the Moon moves below the horizon.
Moonset can occur during the daytime or nighttime depending on the Moon's current phase and position in its orbit.
Moon Phase
The calculator also identifies the Moon's approximate phase, such as:
- New Moon
- Waxing Crescent
- First Quarter
- Waxing Gibbous
- Full Moon
- Waning Gibbous
- Last Quarter
- Waning Crescent
The Moon completes its cycle through these phases approximately every 29.5 days.
How to Use the Sun Rise & Moon Calculator
Using the calculator requires only a few steps.
Step 1: Enter Your Latitude
Enter the latitude of your location between -90 and 90 degrees.
Positive values generally represent locations north of the equator, while negative values represent locations south of the equator.
Step 2: Enter Your Longitude
Enter your longitude between -180 and 180 degrees.
Longitude identifies your position east or west of the Prime Meridian.
Step 3: Select a Date
Choose the date for which you want to calculate solar and lunar times.
The calculator automatically provides the current date as the default date, but you can select another date if you want to check sunrise, sunset, moonrise, or moonset for a different day.
Step 4: Click Calculate
After entering your location and date, click the Calculate button.
The calculator will display the estimated sunrise, sunset, moonrise, moonset, and Moon phase.
Why Do Latitude and Longitude Matter?
Latitude and longitude are essential for determining astronomical events at a particular location.
Two cities can experience different sunrise and sunset times on the same date because they are located at different geographic coordinates.
For example, moving east or west changes the local solar time, while moving north or south affects the Sun's apparent path across the sky and the length of daylight throughout the year.
Why Does Sunrise Change During the Year?
Sunrise does not occur at exactly the same time every day.
One major reason is Earth's approximately 23.4-degree axial tilt. As Earth travels around the Sun, different parts of the planet receive sunlight at different angles.
This produces the seasons and changes the length of daylight.
During summer, many locations experience earlier sunrises and later sunsets. During winter, sunrise can occur later and sunset can occur earlier.
The effect is particularly noticeable at higher latitudes.
Why Does the Moon Rise at Different Times?
The Moon's orbit around Earth causes its position in the sky to change relatively quickly.
The Moon moves approximately 13 degrees eastward relative to the background stars each day. As a result, the Moon generally rises later each day, although the exact difference varies.
The Moon's phase also affects when it is visible.
For example:
- A New Moon is close to the Sun in the sky and is difficult to see at night.
- A First Quarter Moon is generally visible from afternoon into evening.
- A Full Moon rises around sunset and sets around sunrise.
- A Last Quarter Moon is generally visible during the late night and morning hours.
Understanding the Moon Phases
New Moon
During a New Moon, the Moon is positioned approximately between Earth and the Sun from our perspective. The illuminated side largely faces away from Earth, making the Moon difficult to see.
Waxing Crescent
A small portion of the Moon becomes visible after the New Moon. The illuminated portion gradually increases each day.
First Quarter
Approximately half of the visible lunar disk is illuminated. Despite its name, the First Quarter represents roughly one-quarter of the Moon's complete cycle.
Waxing Gibbous
More than half of the visible Moon is illuminated, and the illuminated portion continues increasing toward the Full Moon.
Full Moon
The Moon's Earth-facing side is approximately fully illuminated. A Full Moon generally rises around sunset and sets around sunrise.
Waning Gibbous
After the Full Moon, the illuminated portion begins decreasing.
Last Quarter
Approximately half of the visible lunar disk is illuminated again, but the opposite side from the First Quarter is illuminated.
Waning Crescent
Only a small portion of the Moon remains illuminated before the cycle returns to the New Moon.
Sunrise and Sunset Around the World
Sunrise and sunset are strongly influenced by geographic location.
Near the equator, daylight duration changes relatively little throughout the year. At higher latitudes, seasonal changes can become much more dramatic.
Near the Arctic and Antarctic Circles, some locations can experience periods when the Sun remains above or below the horizon for extended periods.
This means a simple sunrise or sunset calculation may not always produce a normal clock time at extreme latitudes. In certain locations and seasons, the Sun may not rise or set at all on a particular date.
What Is the Difference Between Sunrise and First Light?
Sunrise should not be confused with the beginning of daylight.
First light can refer to the beginning of twilight, when the sky starts becoming illuminated before the Sun reaches the horizon.
Astronomers and photographers often distinguish between different stages of twilight, including:
- Astronomical twilight
- Nautical twilight
- Civil twilight
- Sunrise
Therefore, if you're planning photography, hiking, or another outdoor activity, the sunrise time alone may not tell you when the sky will first become bright.
Are the Calculator Results Exact?
The results from an online calculator should be treated as approximations.
Actual observed sunrise, sunset, moonrise, and moonset can differ slightly because astronomical calculations involve factors such as atmospheric refraction, the apparent size of the Sun and Moon, elevation, and the exact definition of when an object is considered to have crossed the horizon.
The calculator is useful for general planning and astronomical reference, but specialized astronomical software or official observatory data may be preferable when very high precision is required.
What Is the Importance of the Moon Phase?
Knowing the Moon phase can be useful for astronomy, photography, night-sky observation, and planning activities that depend on natural nighttime illumination.
A Full Moon produces considerably more natural light than a New Moon, while a thin crescent may provide darker skies that are useful for observing faint celestial objects.
The Moon phase can therefore help you understand what to expect when looking at the night sky.
Frequently Asked Questions
How do I calculate sunrise time?
Enter your location's latitude and longitude along with the date into the calculator. The tool uses the geographic coordinates and date to estimate the local sunrise time.
How do I calculate sunset time?
Select the desired date and enter the latitude and longitude of your location. The calculator estimates when the Sun will cross the western horizon.
How can I find moonrise and moonset?
Enter your geographic coordinates and date. The calculator estimates the Moon's rising and setting times for that location.
Does the Moon rise at the same time every day?
No. The Moon's rising time changes from day to day because the Moon moves around Earth.
What information do I need to calculate sunrise?
You need the latitude, longitude, and date of the location you're interested in.
Can I use the calculator for any location?
Yes. You can enter coordinates anywhere within the supported latitude and longitude ranges. Results can vary significantly depending on the location.
Why are my sunrise and sunset times different from another website?
Different calculators may use different astronomical models, atmospheric assumptions, elevation settings, timezone handling, or definitions of sunrise and sunset. Small differences are therefore possible.
Plan Your Day and Explore the Night Sky
The Sun Rise & Moon Calculator provides a convenient way to explore the daily movements of the Sun and Moon. With just a latitude, longitude, and date, you can estimate sunrise, sunset, moonrise, moonset, and the current lunar phase.
Use the calculator whenever you want to plan around daylight, prepare for nighttime sky observation, or simply learn more about the changing positions of the Sun and Moon.