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A comment on Show HN: I made a website to find best bus seat to avoid the sun while traveling. Parent comment

Re:Show HN: I made a website to find best bus seat to avoid ... by grecy on Wednesday January 17, 2024 @01:33PM (#39031553)
> P.S. Using this has made it clear to me how bad most sunrise/sunset calculators actually are.

That may just be a function of how you define "sunrise" and "sunset". It is never as simple as "when the sun hits the horizon", but something about some number of arc minutes from something something.

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Re:Show HN: I made a website to find best bus seat to avoid ... by wizzwizz4 on Wednesday January 17, 2024 @01:52PM (#39031787)
Dependent on the refractive index, which depends on air density and temperature and humidity too; and we have to integrate over the region between the horizon and the upper atmosphere (diagonally, of course)…
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Re:Show HN: I made a website to find best bus seat to avoid ... by grecy on Wednesday January 17, 2024 @06:21PM (#39035049)
Haha, thanks ,yep. I learned all this when I lived in the Yukon and sunset takes about 2 hours...
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Re:Show HN: I made a website to find best bus seat to avoid ... by antgiant on Friday January 19, 2024 @03:14PM (#39060472)
To be clear I was complaining that basically everyone calculates “sunrise” and “sunset” differently. If you check half a dozen different “sunset” calculators you will get a surprisingly wide variation in the times they provide. At least where I live the error seems to average 5-10 minutes.
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Re:Show HN: I made a website to find best bus seat to avoid ... by grecy on Friday January 19, 2024 @08:19PM (#39063647)
> At least where I live the error seems to average 5-10 minutes

And what I meant was you are not seeing "error", it's just a difference in definition.

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