Thread: Simulating The Sun In The Sky

  1. #1
    Registered /usr
    Join Date
    Aug 2001
    Newport, South Wales, UK

    Simulating The Sun In The Sky


    I'm thinking of perhaps using the system time as a base for implementing real-time daylight in a game, i.e. if you're playing the game at 10pm it will be dark in game, early afternoon the sun will be out, etc.

    To this end, I've knocked up a ridiculously simple Windows-based model, attached. At the moment all it does it get the system time, translate it using the current time zone and use the hour to determine where the sun should be (for now I'm assuming that the sun rises at 6am and sets at 6pm).

    Here comes the science bit:- is there a way that I can determine when the sun rises and sets given a time zone? Can I account for those weird places like northern Sweden where they have perpetual darkness/daylight? Would I be able to calculate this or should I instead refer to some sort of Internet database to retrieve the values?

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    You mean like this?

    I think all you need is the time and Axial tilt to work out what part of the earth is illuminated at any point.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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