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This app uses Google Cloud Messaging to inform you when it may be possible to see the Northern Lights (Aurora Borealis).If you are notified too often, …

This is an add-on package for AuroraNotifer. It provides location for AuroraNotifer so that it can tell you when it's dark outside among other thi …

Enter the temperature, the air pressure and the relative humidity and get the relative air density (RAD). This is a very basic calculator for this.免費玩 …