In an effort to better understand the loss of the night sky due to light pollution, astronomers are calling on star-lovers and romantics to enjoy a night under the stars and give them a helping hand.

Each year, a group of astronomers, headed by Connie Walker at the National Science Foundation's National Optical-Infrared Astronomy Research Laboratoryin Tucson, Az., conduct the Globe at Night project, whichasks people around the world to step out and record how many stars they see in a specific constellation.

This, in turn, will allow them to gauge how dark or bright the night sky is in a particular location.

This year, the campaign has two runs, the first from Feb. 14 to 23 and the second from March 14 to 24.

"The Globe at Night is a social science program. That means every citizen can be an actual scientist and contribute data. And it's extremely easy to do," said Walker. "People can get involved very simply by just going out in the night, then looking up at the stars."

For Valentine's Day, the particular constellation the project is asking citizen scientists to look at is Orion.

Walker said that the whole process is easy, particularly as Orion is one of the most recognizable constellations in the northern hemisphere this time of year.

Participants are asked to visit the Globe at Night's webapp. It asks the time and date and your location (it can also do this automatically). Then there are seven illustrations to choose from, based on how many stars you saw. And finally, it asks you what the sky conditions were at the time of observation, i.e. partly cloudy, etc.

Walker explained the difference between the charts, which measure the magnitudes or apparent brightness of the star.

"So, one, it's like you would see in New York City, where there's just a couple of stars at best if you see any at all towards Orion," she said. "And thenseven, it's like you're in the national parks, where you see a couple thousand stars."

Most people probably don't think of light as a form of pollution, but it's something that has serious consequences for human health, the environment and wildlife.

For example, light pollution which is simply defined as the "inappropriate or excessive use of light," according to the International Dark-Sky Association (IDA) has affected the nesting habits of sea turtles. There are also estimates that 300,000 to one billion birds die annually from flying into buildings, because they are drawn to the bright lights at night.

As for humans, some studies have linked artificial light with forms of cancer.

About 54 per cent of people around the world live in cities. In Canada, that number soars to more than 80 per cent. As a consequence,most people across the planet have not seen the Milky Way.

Though many people and communities have switched to energy-saving LED lights, a 2017 study by Canadian Christopher Kyba, a light pollution researcher at the GFZ German Research Centre for Geosciences, found that these lights might actually be doing more harm than good.

Because the lights cost less, it appears more of them are being used. Kyba, who is involved in the Globe at Night project,is looking to conduct follow-up studies to determine if the night sky brightness is increasing or decreasing.

But why does it matter if we see the stars or not?

"It's part of our cultural heritage. It has inspired humanity, since the beginning of humanity, for tens of thousands of years. It is an infinite resource for wonder, and it's where all of our thoughts about science began," Walker said. "And it's not just science. It's the inspiration to be creative in terms of music, like [Gustav] Holst's The Planets,or literature like Shakespeare .... and then paintings, likeVan Gogh.

"If we take away that source of inspiration. What is it going to do to our culture?"

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Astronomers want you to help them count the stars this Valentine's Day - CBC.ca