From Seattle , NGC 3631 is visible in both the dusk and dawn skies. In the evening, it will become visible around 20:25 (PDT), 23° above your north-western horizon, as dusk fades to darkness. It will then sink towards the horizon, becoming tricky to observe after 20:38 when it dips 21° above your north-western horizon. At 04:19, it will return to an altitude of 21° above your north-eastern horizon, and reach an altitude of 30° before fading from view as dawn breaks around 05:41.