Sun Position Widget

This is a Home Screen Widget, there's no app icon for it. Usually you need a long press on your home screen to add widgets or open the Apps and select the Widgets tab.

This widget is built solely to display the current position of the sun which is known as solar altitude angle or solar elevation angle, and opposite of solar zenith angle.


Features
 • Tap to refresh/configure
 • Display altitude angle
 • Display part of the day ↓
 • Set thresholds ↓
 • Personalize to your needs
 • Beautiful widget backgrounds
 • Follows you wherever you are
 • Auto-updates every 30 minutes

Thresholds
Ever wanted to know at an easy glance when the sunset will be today or when will it get dark? You're in the right place; you can easily set up a threshold to see when the sun will transition to a given angle range, here are a few examples:
 • sunrise and sunset (default)
 • start/end of twilights (presets)
 • UV/B benefits (preset) ↓
 • Any custom angle
If you want more of these, just put more widgets, they are don't occupy much home screen space.

UV/B benefits
Your health can benefit from – not more than 30 minutes a day – exposure to the Sun when it's high enough. The atmosphere only lets UV/B rays through when the Sun is above 50°. This is not a health advice, read more on this:
 • http://articles.mercola.com/sites/articles/archive/2012/09/29/sun-exposure-vitamin-d-production-benefits.aspx
 • http://articles.mercola.com/sites/articles/archive/2012/03/26/maximizing-vitamin-d-exposure.aspx

Parts of the day
The widget will display the following part of the day, each with a corresponding background image:
 • sunrise, sunset at 0°: short period of time when the Sun transitions over the horizon
 • day-time, night: longer parts of the day when the Sun is farthest from the horizon
 • civil twilight, dawn/dusk at -6°: the sky is dull blue, lighting conditions are suitable for every-day activities, but there are no shadows
 • nautical twilight, dawn/dusk at -12°: the sky is very dark blue, some stars become visible, the horizon is still visible
 • astronomical twilight, dawn/dusk at -18°: the sky is already black, stars become apparently visible

Read more about
 • twilights: http://en.wikipedia.org/wiki/Twilight
 • altitude angle: http://en.wikipedia.org/wiki/Solar_zenith_angle
 • light pollution ☹: https://www.mensjournal.com/features/where-did-all-the-stars-go-20131115


Permissions
GPS Location: the Sun's position highly depends on where on Earth you are. Few kilometers away and the sunset already a few minutes different. Don't worry about battery drain, the widget uses the last location if available. Only updates when the screen is on every 30 minutes; or when you tap it.

Background Location: home screen widgets need to access location all the time in order to show up-to-date information.

Any feedback is warmly welcome and will be taken into consideration!

The Android robot is reproduced or modified from work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License.