Yes, I have observed a number of planets during daylight hours in my NexStar 9.25 inch SCT using its Go-To ability. Venus is quite easy and is often visible to the unaided eye, so I sometimes use it to "tweak" the Go-To system's alignment after the initial setup. Mercury is a little more risky, but during the day, I can usually pick out its off-white color and see the phase without a lot of difficulty. Mars is harder, but as long as it isn't terribly near the sun, I can usually see its dim pinkish disk and maybe a hint of albedo markings. Jupiter shows two to four belts during the day but doesn't have a lot of contrast. Saturn is more difficult, as it is faint enough that it almost blends into the blue of the daytime sky. Still, it is visible with the rings and the main equatorial belt being the main features seen. Beyond that, the only other solar system bodies I have seen during the daylight hours are the sun, the moon, and Comet McNaught in January of last year when it was near the sun and nearly as bright as Venus. However, I have been able to find a number of the brighter stars in the sky during the day using the NexStar's Go-To ability (down to around 2nd or 3rd magnitude). Clear skies to you.
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