The observer captures the view of the sky regularly at the same sidereal time and constantly sees the Sun on the horizon. Where is the observer and what is sidereal time?
This can happen in a place where at some point in sidereal time the ecliptic coincides with the horizon. Then the Sun will be on the horizon regardless of the season of the year. Accordingly, at this time, the north (a = 18h, 5 = + 66.5 °) or southern (a = 06h, 5 = -66.5 °) pole of the ecliptic should be at the zenith. Consequently, such a picture could be observed in the Arctic Circle at 18 o’clock sidereal time or at the southern polar circle at 6 o’clock sidereal time.
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