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Disregarding the effects of atmospheric refraction . . .

If you're standing at the north pole, then the sun is up in your sky from March 21 to September 21,

and below your horizon from September 21 until March 21.

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15y ago

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What is the purpose of a happy light?

The purpose of a happy light is to boost your mood, specifically during the winter or when working longer hours. This is accomplished by natural spectrum light that is similar to daylight.


Do you have to give your poinsetta plant light?

Yes, poinsettia plants need plenty of indirect sunlight to thrive. Place them near a window where they can receive at least six hours of light each day. Avoid direct sunlight, as it can cause the leaves to burn.


How do you turn poinsettia plants red?

To encourage poinsettia plants to turn red, you need to provide them with specific light conditions. Starting in late September, place the plants in complete darkness for at least 14 hours a day, ensuring they receive bright, indirect light during the remaining hours. This darkness triggers the plant's natural response to produce the red bracts. Continue this routine for about 6-8 weeks until the desired color develops.


Are lighthouses lit during daylight hours?

No. Lighthouses are not lit in daylight hours, because a lighthouse light is like a giant magnifying glass made up of usually hundreds of prisms. If the light was on in daylight hours the magnified beam of light is capable of focusing the sunlight just like you can do with a hand-held magnifying glass. This laser beam of light could easily ignite dry vegetation as the light sweeps over the land.


How much light does weed plant need?

You don't need any light at all you can put it in your closet and it will grow just fine. You also don't even need to water it because it absorbs the water vapor in the air and turns it into nutrients so that the plant can grow healthy, tall and green.