Declination with respect to the Sun helps determine which of the following?

• A. Solstices and equinoxes and how much daylight we have
• B. Just sunrise time
• C. Length of day only at equator
• D. Sun's azimuth only

Answer: (B)

Declination describes how far north or south the Sun is in the sky over the year. This tilt of the Sun’s apparent path sets the Sun’s altitude at noon and, with latitude, determines how long daylight lasts. When the Sun’s declination reaches its extremes (+23.5° or −23.5°), we get the solstices and the longest or shortest days. When it’s 0°, we have the equinoxes with roughly equal day and night. Because declination changes with seasons, it affects daylight length across latitudes, not just one moment like sunrise time or a single parameter such as azimuth. So the best answer is that declination helps determine solstices and equinoxes and how much daylight we have.