day and night from lat, long, time?

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Nina Schuback
Nina Schuback 2020-4-5
回答： Meysam Mahooti 2021-5-26
I have a vector of latitude, and vector of longitude, and a vector of UTC time.
Is there a simple way to determine whether or not it is day or night at each point? Just a simple 0,1 kind of answer?
  1 个评论
James Tursa
James Tursa 2020-4-5
Convert it to a pointing vector and then find the angle between that and the Sun pointing vector. Do you have a Sun position function?

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Nina Schuback
Nina Schuback 2020-4-7
Thank you for the replies!
I ended up using the sunsetsunrise.m function which gives me sunset and sunrise in UTC!

更多回答（2 个）

Ameer Hamza
Ameer Hamza 2020-4-5
If you have the Mapping toolbox, you can use timezone(): https://www.mathworks.com/help/map/ref/timezone.html to find the hour offset from the UTC given the longitude value.
From the offset value, you can convert the UTC to the local time and based on your threshold, whether it is day or night. Or you can also use datetime() function to convert the UTC to the local time.
Meysam Mahooti
Meysam Mahooti 2021-5-26
https://www.mathworks.com/matlabcentral/fileexchange/60157-sunrise-sunset?s_tid=srchtitle

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