No, viewed is a non-finite verb-form which heads the past participial clause best viewed at night . The sequence is viewed is no more a verb than began cooking in She began cooking dinner . Both is and began are catenative verbs taking non-finite clause complements.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
vsureshHere I think has and gone are seen together as a tense form and thus we cannot call call gone a non finite form.Has gone is present perfect tense, but that doesn’t mean it’s a verb-form, or even a syntactic constituent. The perfect is marked analytically, i.e., by a separate word rather than by inflection. Have is another catenative verb
CliveThis sounds like you look at the telescope ( and perhaps say eg That's a nice telescope. Emotion: smile )Very true. When you’re so focused on syntax you tend to overlook things like that!
Normal English is eg The stars are best viewed at night (through a telescope).