Sundial Builder
Build a sundial at home
Only for iPhone
$4.99
iPhone
HORIZONTAL SUNDIAL
Built on a flat horizontal surface.
- Hour lines converge toward true south in the northern hemisphere, or true north in the southern hemisphere.
- The gnomon is fixed at the "center of the sundial," where the hour lines meet,
is tilted relative to the horizontal plane by an angle equal to the absolute value of the local latitude,
it must point to the celestial north pole (northern hemisphere) or celestial south pole (southern hemisphere).
Required data:
- Latitude between 5° and 80° (use negative values for southern hemisphere)
- Longitude (used only to calculate correction between solar time and civil time)
- Location can be entered manually or retrieved via the device's GPS
- Gnomon length: between 10 cm and 30 cm. The final tilted length is calculated by the app
- Equation of Time and longitude correction are shown on screen and in the CSV file
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VERTICAL SUNDIAL
Built on a vertical wall facing any direction (south, west, east, north, or intermediate).
- Hour lines start from the "center of the sundial" and extend downward
- The gnomon is fixed at this center point
- The gnomon is inclined based on latitude and wall orientation. It equals the latitude only when facing due south or due north
- The gnomon must point to the celestial north pole (northern hemisphere) or celestial south pole (southern hemisphere)
Required data:
- Latitude between 5° and 80° (use negative values for southern hemisphere)
- Longitude (used only for time correction)
- Location can be entered manually or via GPS
- Gnomon length: between 10 cm and 30 cm. The app computes the final inclined length
- Wall orientation:
- Northern hemisphere: 270° (east) to 90° (west)
- Southern hemisphere: 90° (west) to 270°(east)
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GENERAL NOTES
- The scale factor changes the sundial’s visual size but not the CSV values
- Sundials near the edge of a time zone may show up to 30 minutes of difference between solar time and civil time
- The app calculates the inclined gnomon length from the center
- Alternatively, you can place a perpendicular gnomon from the origin point; in this case, only the tip’s shadow indicates the time
- Wall orientation is measured clockwise from south:
- 0° = South
- 90° = West
- 180° = North
- 270° = East
Ratings & Reviews
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Small corrections
The developer, Pietro Massimino, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Piero Massimino
- Size
- 22.7 MB
- Category
- Education
- Compatibility
Requires iOS 11.0 or later.
- iPhone
Requires iOS 11.0 or later. - iPod touch
Requires iOS 11.0 or later.
- Languages
- English and Italian
- Age Rating
4+
- 4+
- Copyright
- © Piero Massimino
