Guide To Archery

Sight Light

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Why is it still light when theres no sun in sight?

Like when I can't see the sun (if its blocked by something), why is there still light where I look/stand?

How much % of that is still sun power?

Good question. Many reasons for it.

1) Reflection.
Other objects near you (the ground, buildings, clouds) all are still being hit by sunrays (even if you're under something blocking the sunlight). Those other objects are like inefficient mirrors - in that the sunlight hitting them reflects some of the light in various directions. Some of that light ends up in your eyes, and you "see" that object.

2) Refraction.
When the sun is rising or setting (near the horizon), for a few extra minutes it appears to be still there but it really is not (it's dissappeared below the horizon). This visibility for the few extra minutes is caused by refraction (bending) of the sunlight. This would let you still see things, even after the sun has truly set (or before it has risen). Similar effects also happen with clouds and other water vapor in the atmosphere - the sunlight is refracted (bent) by those particles and made to fall elsewhere. This is also why when you're under a shade tree, it's not completely dark under there.

3) Lens effects from the atmosphere.
The atmosphere is made up of tiny particles - mostly gasses but also water vapor and other particles (e.g. polution). All of these combine in complex ways, and make the sunlight reflect and refract. The bouncing sunlight eventually ends up going in many directions, in addition to just the straight lines it takes from the sun to earth. Though the amount of sunlight (intensity) caused by such atmospheric effects is much less - that's why even in bright sunlight outside, when you are inside in a building and no light is falling on the windows, only a little of the outside light goes inside the building. Typically, less than 5% of the sunlight gets bounced this way. And much less of that makes it to your eyes, to let you see everything.

I hope this helps.

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Why is it still light when theres no sun in sight?

Like when I can't see the sun (if its blocked by something), why is there still light where I look/stand?

How much % of that is still sun power?

Good question. Many reasons for it.

1) Reflection.
Other objects near you (the ground, buildings, clouds) all are still being hit by sunrays (even if you're under something blocking the sunlight). Those other objects are like inefficient mirrors - in that the sunlight hitting them reflects some of the light in various directions. Some of that light ends up in your eyes, and you "see" that object.

2) Refraction.
When the sun is rising or setting (near the horizon), for a few extra minutes it appears to be still there but it really is not (it's dissappeared below the horizon). This visibility for the few extra minutes is caused by refraction (bending) of the sunlight. This would let you still see things, even after the sun has truly set (or before it has risen). Similar effects also happen with clouds and other water vapor in the atmosphere - the sunlight is refracted (bent) by those particles and made to fall elsewhere. This is also why when you're under a shade tree, it's not completely dark under there.

3) Lens effects from the atmosphere.
The atmosphere is made up of tiny particles - mostly gasses but also water vapor and other particles (e.g. polution). All of these combine in complex ways, and make the sunlight reflect and refract. The bouncing sunlight eventually ends up going in many directions, in addition to just the straight lines it takes from the sun to earth. Though the amount of sunlight (intensity) caused by such atmospheric effects is much less - that's why even in bright sunlight outside, when you are inside in a building and no light is falling on the windows, only a little of the outside light goes inside the building. Typically, less than 5% of the sunlight gets bounced this way. And much less of that makes it to your eyes, to let you see everything.

I hope this helps.

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