When the Sun is near the horizon, by approximately what factor can the light path length increase compared to the overhead path?

Answer

By a factor of ten or more

As the Sun sinks toward the horizon, the path length lengthens substantially; for light passing nearly parallel to the ground, the path length can easily increase by a factor of ten or more compared to the overhead path.

When the Sun is near the horizon, by approximately what factor can the light path length increase compared to the overhead path?

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