Using #2 Spruce-Pine-Fir and a Ground Snow Load of 30psf No ceiling with a Dead Load = 10psf 2X8 are good for a span of 15'1" at 16 on center. 24 on center is only 12' 1".
So if you want to use 2x8 you need to stay 16 o/c. Double 2x10 since It needs to also carry all the 2x8's is not big enough. Double 2x12 with a plywood center is more in order. Post should be at least 6x6 on short end and most likely 8x8 on tall end.
Now let me say this is only to give you advise of places to start what to do since I have no idea where you live.
If you really want some good advise look into steel trusses. You can get 30 foot span for about 250 each and you space them 10 to 12 foot apart so you only need 6 to 7 of them to cover 60 feet. You just mount them to post; put 2x6 purlins on edge and apply tin. Very nice; easy; and come with stamped plans for your county. This is what I will be using in my shed.
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