The sunrise equation as follows can be used to derive the time of sunrise and sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur:

John asked for the formula to work out sunrise and set, as well as for a worked example. I calculated the times for tomorrow 31 October 2007. To follow the calculation you will need to know basic trigonometry. To start the calculation we need from published tables the declination of the Sun on the

To compute sunrise and sunset times is easy, you just need to apply the following formula: where: ωo is the hour angle in degrees at either sunrise (when negative value is taken) or sunset (when positive value is taken) in degree (°)

## 30 how to calculate sunrise and sunset

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John asked for the formula to work out sunrise and set, as well as for a worked example. I calculated the times for tomorrow 31 October 2007. To follow the calculation you will need to know basic trigonometry. To start the calculation we need from published tables the declination of the Sun on the

John asked for the formula to work out sunrise and set, as well as for a worked example. I calculated the times for tomorrow 31 October 2007. To follow the calculation you will need to know basic trigonometry. To start the calculation we need from published tables the declination of the Sun on the

I need to create a function (in C++) to calculate the sunrise and sunset times, but I am not a mathematician and I cannot find a correct (and easy) way to do that. I need to get the same results a…

To compute sunrise and sunset times is easy, you just need to apply the following formula: where: ωo is the hour angle in degrees at either sunrise (when negative value is taken) or sunset (when positive value is taken) in degree (°)

To compute sunrise and sunset times is easy, you just need to apply the following formula: where: ωo is the hour angle in degrees at either sunrise (when negative value is taken) or sunset (when positive value is taken) in degree (°)

@Pat Yes, their tool does calculate sunrise and sunset, but that part of the code is not made public by NOAA to my knowledge. I would love to see it if it is!

I need to create a function (in C++) to calculate the sunrise and sunset times, but I am not a mathematician and I cannot find a correct (and easy) way to do that. I need to get the same results a…

@Pat Yes, their tool does calculate sunrise and sunset, but that part of the code is not made public by NOAA to my knowledge. I would love to see it if it is!

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