Horwitz-DeRemer Planetarium

"Tonight and tomorrow night, peek at the moon to witness ""earthshine!"" Are you familiar with what earthshine is? Earthshine is a dull glow which lights up the unlit part of the Moon because the Sun’s light reflects off the Earth's surface and back onto the Moon. It is also sometimes called ""ashen glow"", ""the old Moon in the new Moon's arms"", or the ""Da Vinci glow"", after Leonardo da Vinci, who explained the phenomenon for the first time in recorded history. Earthshine is best seen a few days before and after a New Moon, right after sunset or before sunrise. Scientists studying global warming found that earthshine is more intense in April and May! Hopefully you will have the chance to check it out! SOURCE: timeanddate.com"

We are on Tripadvisor & we recently updated our profile! If you joined us for a show & enjoyed your experience, we would love it if you take a moment to rate & comment on your visit. We want to remind area residents about us, as well as encourage visitors to come see us!

ALWAYS ABOVE is coming to the Horwitz-DeRemer Planetarium officially this Friday, May 2nd! We are excited to share this show with students during their field trips and our community during public shows. See you in space! #wherethestarshangout

Can you believe that we've flown through the month of April already? Here's to more beautiful spring days in May! Check out the schedule this week and join us for a show if you can! #wherethestarshangout

Somehow, today is the last Saturday in April! So, if you've been meaning to check out Saturday shows, it is your last chance! At 11:00am, we'll show ""Mars: The Ultimate Voyage."" Later at 1:00pm, come to enjoy ""From Earth to the Universe."" Have a great weekend everyone!

Calling all Scouting families! Is your scout working towards earning Merit Badges? Did you know that the Horwitz-DeRemer Planetarium offers 2 different clinics? August 19th- Astronomy Merit Badge Clinic August 21st- Space Exploration Register here- hdplanetarium.ticketleap.com

Happy 35th Birthday to the Hubble Space Telescope! Hubble was deployed on this date in 1990. Check out this link! Enter your birthday & see what image Hubble captured on your birth date! https://science.nasa.gov/mission/hubble/multimedia/what-did-hubble-see-on-your-birthday/

In the morning, today & tomorrow (weather permitting) will be the ideal time to observe "earthshine!" Earthshine is a dull glow which lights up the unlit part of the Moon because the Sun’s light reflects off the Earth's surface and back onto the Moon. SOURCE: timeanddate.com

It's Earth Day today! Wise words for us all to remember... #wherethestarshangout

Have a great week everyone! Also, don't forget that we have Sunset Meditation on Wednesday. If you are interested in attending, be sure to register ASAP on the Waukesha County website! #wherethestarshangout

Happy Easter, all! #wherethstarshangout

Come and see us at the planetarium today! At 11am, join us for ""Mars: The Ultimate Voyage."" In the afternoon at 1pm, we'll feature ""From Earth to the Universe."" Tickets are $5/person and can be purchased upon arrival or at hdplanetarium.ticketleap.com!

The next few mornings will be ideal to try and take a peek at the planet, Mercury! It will be at its furthest distance from the Sun in the morning sky. This is also known as ""greatest elongation west,"" which officially occurs on April 21st. Catch it if you can!

So far, 2025 has been an great year for viewing planets in our night sky! Did you know that fancy equipment (telescope or binoculars) is NOT needed to see a planet? Your eyes will do just fine! Check out this stellar article all about planet viewing! Source: adlerplanetarium.org

Join us for an excellent show this morning! Our public show for today is ""Voyage to Distant Worlds"" and it starts at 11am. Grab your tickets ahead of time at hdplanetarium.ticketleap.com or walk-ins are welcome, as seats are available! #wherethestarshangout

Our second Sunset Meditation of this spring is coming up next Wednesday, April 23rd! If you are interested, sign up ASAP as registration closes Tuesday 4/22 at 12pm! You may call Retzer at (262) 896-8007 to save your spot(s). This beautiful evening begins at the Horwitz-DeRemer Planetarium at 7:30pm with a peaceful planetarium show. Immediately following, one of Retzer's amazing naturalists will take interested participants on a evening hike on the trails. Cost is $10 per person. Hope you will join us! #wherethestarshangout

In case you haven't heard, from now until April 18, early risers anywhere in the world will get to see an unusual cluster of three planets: Mercury, Venus, & Saturn. Please note: We know that Neptune is labeled in the picture. However, you cannot see Neptune with just you eyes.

Here's our schedule for the week. If you can, we'd love for you to join us for a show! #wherethestarshangout

Thank goodness it's Saturday! We'd love for you to come visit today! Here's our schedule: At 11am, we'll be featuring "Mars: The Ultimate Voyage." Later at 1pm, join us for "From Earth to the Universe." Tickets are only $5 per person. Have a great weekend! #wherethestarshangout

Tomorrow night is April's full moon! It is most commonly known as the Pink Moon. Northern Native Americans gave it that name. But this full moon may also be known as the Sprouting Grass Moon, Growing Moon, Egg Moon or Fish Moon. Which 1 do you prefer?