Mr. D.

[National Weather Service @NWS]

Today is the official start of Spring: the Spring/Vernal Equinox! 5:37am this morning marked the time when the day-to-night line, called the terminator, was perfectly vertical from pole to pole. #SpringEquinox #FirstDayOfSpring

[NASA @NASA]

Touchdown confirmed. The #CountdownToMars is complete, but the mission is just beginning.

[ARCHIVED - NASA's Perseverance Mars Rover @NASAPersevere]

I’m safe on Mars. Perseverance will get you anywhere.

#CountdownToMars

[Mr. D. @PacEarthScience]

If all goes well.... I will be landing on Mars in about 20 minutes. 😉�� #CountdownToMars

[NASA @NASA]

📣 Roll Call: Who is riding along on the fantastic voyage to Mars with @NASAPersevere? Reply with your #CountdownToMars boarding pass!

[NASA @NASA]

It's a delicate dance planned down to the second. Now, it's time to execute.

#CountdownToMars with a play by play of the technical maneuvers & key milestones @NASAPersevere will make in the 7 minutes before landing on the Red Planet: https://t.co/wlzqM9D4BS

[US Department of the Interior @Interior]

A vibrant sky over the Muscatatuck National Wildlife Refuge shows off the beauty of wetlands like this one. But they also recharge groundwater, reduce flooding, supply clean drinking water, support wildlife, help against climate change & offer us a place to explore

[NASA HQ PHOTO @nasahqphoto]

The Empire State Building is illuminated in red to celebrate this Thursday's scheduled landing on Mars of @NASAPersevere rover! More 📷 https://t.co/1C6QkuRetg

[CIRA @CIRA_CSU]

Happy Solstice!

Watch as the terminator shifts, from solstice to solstice.

[NASA @NASA]

Skywatchers, you're in for a once-in-a-lifetime treat! Jupiter & Saturn are doing a planetary dance that will result in the Great Conjunction on Dec 21, just after sunset. Find out:

🤩 When and where to look up
📷 How to photograph the conjunction

Visit: https://t.co/SdQSLex2Ex

[USGS @USGS]

How delicious would it be if Butter Creek and Syrup Creek flowed into Waffle Lake?? Happy #NationalMapleSyrupDay!

[US Department of the Interior @Interior]

A layer cake of cliffs forms a feast for your eyes @GrandCanyonNPS. The soft glow of twilight illuminates the vast canyon landscape just after sunset with a riot of colors #Arizona

[National Weather Service @NWS]

😲🤯☀️🌕 @NOAA's GOES East satellite is capturing the shadow of this morning's solar eclipse as it traverses South America.

[Mr. D. @PacEarthScience]

Get out those black & white cookies! Happy Fall Equinox....we are revolving and revolving and revolving...... 😉🌎

[National Weather Service @NWS]

The official start of Fall - the Fall/Autumnal Equinox - is THIS MORNING, at 9:30 AM EDT. This marks the time when the day-to-night line, called the terminator, is perfectly vertical from pole to pole and the sun is directly over the equator. #FallEquinox #FirstDayOfFall

[USGS @USGS]

[FAQ] What is the Earth's "water cycle?"
https://t.co/T1QzDJIQMT
#watercycle #hydrologic

[Trevor Packer @AP_Trevor]

The 2020 AP Environmental Science scores: 5: 11.8%; 4: 28.3%; 3: 13%; 2: 25.4%; 1: 21.5%.

[NOAA Satellites - Public Affairs @NOAASatellitePA]

#SATELLITE SPOTLIGHT: #AstronomicalSummer is here! And to celebrate, we are taking you on a trip as #Earth makes its yearly trek around the #Sun. Notice how @NOAA's #GOES16🛰️ shows the sun angle change from #winter to #summer and back again. https://t.co/rdhfjlnegH

[Mr. D. @PacEarthScience]

Enjoy the high angle of INSOLATION today! 😉😀🌎 Good times!!

[National Weather Service @NWS]

Summer solstice - the first day of astronomical Summer - is THIS AFTERNOON at 5:43pm Eastern. Today has the most daylight of the year in the Northern Hemisphere.

Number of hours of daylight:
Utqiagvik, AK - 24:00
New York - 15:06
Los Angeles - 14:26
Miami - 13:45
South Pole - 0

[Mr. D. @PacEarthScience]

This sign rocks! #WeAreMHS = Good Times. 😎 Thank You!

[Mr. D. @PacEarthScience]

Big day today! Be sure to watch. Let's hope the weather holds.

[NASA @NASA]

They’re ready. Are you?⁣

#LaunchAmerica