Why is longitude harder to measure than latitude?

Longitude is much harder to calculate than latitude.

Explanation:

The Earth rotates 360° per day, which is 15° per hour, and so there's a direct relationship between longitude and the time that the Sun rises and sets

answer; seattle and los angeles; (west)

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.