I think what you want for night sky viewing is 7x50. Light admitting.
dear handy,
Yes, the 7x50’s are good for that and boating, but from the BIRDING standpoint, since in this day and age, 7x35’s are less costly and can and are being used for more than one type of ‘viewing’, is why I used them as an example.
For backyard birding, astronomical binoculars are akin to using a 300mm focal length camera lens for a subject at 10 feet distance.