What are the parameters for What's in the Sky Tonight?

What are the parameters for What’s in the Sky Tonight ?
Maybe I’m missing something, but some of the targets suggested are not ideal for that particular night. Maybe at a different time of the year, but not on that particular night.

Please bring me up to speed for I have not found any advantage of using that feature on the website.

For instance, Pleiades doesn’t appear over my preset 30 degrees until 2:44am and the Zenith doesn’t occur until 7:15am in the morning. That particular target shouldn’t even appear in the list ?

See image attached

Since it’s impossible to predict what kind of targets each user will prefer (visual vs. astrophotography; early vs. late session, etc.), the homepage suggestions are a random selection considering some of these things:

  • Objects must reach an altitude of at least 30 degrees for one hour during the astronomical night - that’s why you see objects staying above 30 degrees for one hour right before the sunrise.

  • Objects are filtered by size depending on their types (e.g. galaxies have a minimum size requirement of 5 arcmin, while galaxy clusters have a maximum size of 5 degrees)

  • Depending on the current date, a minimum distance to the moon is required too, using the Moon-Avoidance Lorentzian

In the near future I’ll be refactoring this section when I release the upgraded DSO database so I might tweak these parameters a bit.

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Now it makes sense to why I couldn’t make sense of it :wink:

I always check that feature when I initially log on to the website, but always end of using the more versatile and informative DSO Targets feature

Thank you for the explanation

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Ooooo new toys! Is there any info on what you’re planning to implement?

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