![]() ![]() If you do use binoculars or a scope to get a better glimpse at evening objects, remember: never look directly at the Sun, especially through magnification, unless you have special filters for solar viewing. The twilight sky is largely too bright for deep-sky astronomy, so if you want to observe during twilight it’s best to focus on what we can see with the unaided eye. For the other two, I would have to zero in on the answer by looking at the altitude, like you have suggested.So much can be seen in the sky as the Sun begins to set and the world gets a little darker. Most seem based on Jean Meeus's 'Astronomical Algorithms' book and only the last one directly calculates dawn/dusk. Also, the lat/lon that these sites use may be different from what I plug into Astronomy Engine which may account for some differences.ĭuring my researching, I also found the following javascript libraries which calculate the sun's position. I realize that these may not be "authoritative", but they match each other, so that seemed pretty good to me. Here are the two sources that I was using to compare results. The only missing piece is dawn/dusk, which is why I wrote this question :) In comparing the two libraries and also comparing against other sources (see below), I realized that SunCal isn't accurate, so I plan to switch to using your library. At a point in my project I needed to also have the dates for the solstices and equinoxes, so I went researching and found your library. It bases its calculations on this article. It supports a number of important markers (golden hour, sunset start/end, night, nadir, etc) that you may also want to consider. I was using the SunCalc library to get various times related to the sun and moon. I appreciate your willingness to add this functionality to your wonderful library. I did a little more reading and I now understand the difference between hour angles and altitude. To help me implement this, can you give me a link to where you find the reputable sources of test data? I will use them to create unit tests for the new function.īeta Was this translation helpful? Give feedback.
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