RASC Light Pollution

The Royal Astronomical Society of Canada promotes responsible lighting to protect the natural dark sky from light pollution as part of a healthy environment.

[RASC Light Pollution @RASC_LPA]

#CircadianRhythm

[The Nobel Prize @NobelPrize]

For many years we knew humans have an internal, biological clock that helps them anticipate and adapt to the regular rhythm of the day. But how does this clock actually work?

Laureates Jeffrey Hall, Michael Rosbash and Michael Young found out how: https://t.co/OTjnfitsEC

[Save Standard Time @SaveStandard]

Later sunsets—by misaligned time zones or by Daylight Saving Time—correspond to later bedtimes, less sleep, more heart attacks, more obesity, more cancer, more diabetes, more accidents, and lower wages.

[EcoFriendlyWest (find us at @ecofriendlywest.bsky) @ecofriendlywest]

Nightfaring: “In the end, my journey through the night was one of connection … The darkness holds it all. The potential, the discoveries, the legends, and the purpose of life rests in the shadow beyond what we can see.” https://t.co/RJrMGNZ6TD

[Save Standard Time @SaveStandard]

Permanent DST would put Red Deer sunrise past 8am for 5 months, past 9am for 2¾ months, as late as 9:46am! 🚨 It’s a mandate to wake an hour early all winter in unnatural darkness. 👉 Amend Bill 31 to permanent MST, the clock set more honestly to the sun! @AdrianaLaGrange @JasonNixonAB

[Dr. John Barentine FRAS @JohnBarentine]

Is the world at night getting brighter? Yes—but it’s complicated. New research shows that while local light levels are more volatile than ever, global light pollution is still rising by 2% a year. The "eye in the sky" tells a clear story: https://t.co/PHWrYoKF9Z

#LightPollution

[RASC Light Pollution @RASC_LPA]

#CircadianRhythm

[The Nobel Prize @NobelPrize]

For many years we knew humans have an internal, biological clock that helps them anticipate and adapt to the regular rhythm of the day. But how does this clock actually work?

Laureates Jeffrey Hall, Michael Rosbash and Michael Young found out how: https://t.co/OTjnfitsEC

[Save Standard Time @SaveStandard]

Why not permanent MST? Albertans voted against permanent DST, but Premier Smith advances it anyway. Leader Nenshi criticizes her move. Calgary’s Dr Antle warns against its 10am sunrises. 3-minute video: https://t.co/pPGdzxHrTV

[Nature Canada @NatureCanada]

Help save migratory birds on their way home this year by turning off your lights at night.

You can also print this post to help spread the word in your neighbourhood!

[RASC Light Pollution @RASC_LPA]

West coast First Nation looking to couple #darkskies with #tourism. https://t.co/unVvhc40RO

[RASC Light Pollution @RASC_LPA]

If you want to do more than a symbolic gesture, consider leaving your outdoor lights off and minimizing your indoor lighting (close curtains!) overnight during the spring #bird migration period, typically to the end of May. @FLAPCanada @SafeWingsOtt @CalgaryResponse @NatureCanada

[The Weather Network @weathernetwork]

On Saturday night, millions across the globe will partake in #EarthHour, but the annual event can be more than just 60 minutes of electricity conservation—it can be the catalyst for change to reshape the planet's future
https://t.co/3zyIxEueH2

[Dr. John Barentine FRAS @JohnBarentine]

Nature Astronomy editorial: "With threats to astronomy from all directions, we must consider the true value of astronomy ... that we should be regularly reminding our elected representatives about."

https://t.co/59z6RfG8zs

[One Green Planet @OneGreenPlanet]

New York Light Pollution Bill Could Protect Wildlife And Save Energy https://t.co/Ls1Mgd1x9O

[Curiosity @CuriosityonX]

In 1994, during a power outage, the only time the Milky Way was visible in the city of Los Angeles, many people were scared by the sight and called 911.

[Save Standard Time @SaveStandard]

Permanent Standard Time brings us closer to nature’s rhythms. #DitchDST

[Vicki Hird MSc FRES 🐝🦋 🍃💚🍃 @vickihird]

What a superb article - a long read plus graphics on insect migration! https://t.co/rlnpf9IVYP

[Dr. John Barentine FRAS @JohnBarentine]

"'These proposals would not only have a disastrous impact on the science of astronomy, they would also hinder the right of everybody on Earth to enjoy the night sky. That is unacceptable.'" (via @itvnews)

https://t.co/8RCsWeKXbM

[RASC Light Pollution @RASC_LPA]

There was a bioblitz event in 2025 at the Cypress Hills #DarkSky Preserve, here's the final species tally: https://t.co/FI6aJxAuff

[Rob Sheppard 🛠️🔭🗜️⚓️🛸🏒🍻 @photonspectra1]

@RASC_LPA 🤢

https://t.co/ttGgHorMJe

[RASC Montreal Centre @RASCMontreal]

Join RASC Montreal online to celebrate Dark Skies, difficult to find in Montreal!
JAC Astro presents Earth Hour, learn about RASC's Light Pollution Abatement initiatives, and explore travel astrophotography as Dr. Russell Fralich shares his adventures.
Sunday, Mar 22nd 4pm EDT

[RASC Light Pollution @RASC_LPA]

Some long-distance migrating #moths use magnetic fields to navigate, others use star patterns. https://t.co/CfZkiAISkm