is it true ????

Question

is it true that canada really have days without light ???

Answer 1

To be visible at noon, the "distance" between the observer's latitude and the Sun's declination must be less than 90 degrees.

At winter solstice, the Sun's declination is 23.4393 S.
90 degrees north of that is latitude 66.5607 N (the Arctic circle).

Anyone north of that line cannot see the Sun above the horizon on the date of Winter Solstice.

In practice, air refraction plus the fact that the Sun's disk has a size of 30 minutes (of apparent angle), you have to go almost 2 more degrees north to be certain not to see the Sun.

However, the Sun is very close, below the horizon so you still get twilight.

Civil twilight (light enough to go about normal business) is when the Sun is less than 6 degrees below the horizon. For many legal purposes (e.g., must have lights on car), once the Sun is more than 6 degrees below the horizon, this is night. This includes the 2 degrees of refraction + disk size.

So, you'd have to go to latitude 66.5607 N + 6 = 72 33' 38" N to get a day without any light at all (not even civil twilight).

If you go further north (I went to a met station at Eureka = 80 N), you get a longer period without any light. As soon as the Sun's declination passes south of 10 S, the Sun does not rise in Eureka: from near the end of October to a little past mid-February.

From mid November to end of January, they don't even get twilight.

Answer 2

The earth is tilted 23 degrees to the plane of her orbit of the sun. That means that if you are above 77N or below 77S degrees latitude, there will come a point in the year when the sun will not rise. And six months later a point when the sun will not set.

At 78 degrees this will happen very near the equinox and last for a short time. You will see the pre dawn light but the sun will not actually rise.

The closer to the poles you get the sooner before equinox this will happen and the longer after equinox it will be before the sun rises the first time. The other six months will be long days.

Until finally at the North or South pole, the sun will rise once a year at equinox and set six months later at equinox. The sun will move around the sky but will not move up or down in the sky on a daily basis at all. It will rise so slowly that it will look like sunrise at dawn for weeks. Then it will be dark for six months.

Jerry

Answer 3

This is only partially true, and at that, only true during some times of the year (namely winter) and involves a really northern canada latitude. Iy you're that far north, the way that the earth is spinning is such that those parts in northernmost Canada have a brief 1/2 hour of sunrise and then its sunset almost immediately thereafter. I dont know of any places that are completely dark for a full day without light, i just dont think that this is possible, but you can have days of only like an hour of light. Cool huh?.

Answer 4

You're kidding, right? Someone is pulling your leg.

In the dead of northern hemisphere winter, all areas of the world above the Arctic Circle will experience at least some days where the sun doesn't rise above the horizon.
And that includes part of the US as well (much of Alaska is north of the Arctic Circle).

Most of Canada's 10 million square kilometers of land is south of the Arctic Circle and we do get sunlight even in the winter - in fact, there are parts of Canada that are further south than parts of the US.

Answer 5

Only the part that's north of the arctic circle. However most of the people in Canada live pretty close to the American border, well south of the arctic circle.

Answer 6

Yes, depending on how far north you are located. There's a comic book with that and zampires as the theme, it's called,"Thirty Days of Night," set in Alaska. I do believe a movie of that comic book is soon to come out. It's detemined by how far north you are located.

Answer 7

yeah