This series of caches was inspired from Geocaching HQ's Planetary Pursuit in 2018. Planetary Pursuit FAQ
These caches can also potentially be found in the dark. (I did not check or attempt) But the caches do supposedly glow in the dark and not sure how long they will last after it gets dark out.
About Neptune: Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 AU (4.5 billion km). It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident.
The Geocache Notification Form has been submitted to of the Wisconsin DNR. Geocaches placed on Wisconsin Department of Natural Resource managed lands require permission by means of a notification form. Please print out a paper copy of the notification form, fill in all required information, then submit it to the land manager. The DNR Notification form and land manager information can be obtained at: http://dnr.wi.gov/files/PDF/forms/2500/2500-118.pdf