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Where is the eastern horizon, solstices and equinoxes in relation to one another?

Answer 1

Revolving-about-Sun Earth (E)-to-Sun (S) direction ES is the eastern horizon. Equinoxes are the instants when the Earth's poles are in the ecliptic. At solstices, poles are farthest from the ecliptic.

An equinox is the moment (by about 21st March and 23rd September) at which the Sun is directly overhead, at the location where the equator transits the ecliptic. When this transit is farthest away from the ecliptic, it is a solstice (by about 21st June and 21st December). For the same observer, the morning East is seen as evening west due to the Earth's day-night spin about its axis.

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Answer 2

Hunter Arthur

The sun rises on the eastern horizon; it rises due east on the equinoxes and at its northern or southernmost points on the horizon during the solstices.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.