What happens as light travels from the sun down to earth?

Photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes. The transfer of energy from the sun across nearly empty space (vacuum) is accomplished primarily by radiation. Radiation is the transfer of energy by electromagnetic wave motion. Once the sun’s energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun’s energy is directly absorbed, particularly by certain gases such as ozone and water vapor. Some of the sun’s energy is reflected back to space by clouds and the earth’s surface.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)