Anthelion

An anthelion is a rare optical phenomenon of the halo family. It appears on the parhelic circle opposite to the sun as a faint white spot, not unlike a sundog, and may be crossed by an X-shaped pair of diffuse arcs.

Wikipedia

There are many potential explanations for sightings. We recommend eliminating the most common and mundane before jumping to less probable conclusions or you submit a report.

Report a Sighting

Resources

Traffic Control Trackers

Live flight tracking maps are available for monitoring airline, marine, and balloon traffic and trajectories in real-time or historically around the world.

ADS-B Exchange

FlightAware

Flightradar24

Marine Traffic

PlaneFinder

RadarBox

SondeHub Tracker (tracks both meteorological and amateur radio sondes, including radiosondes used by weather services and enthusiasts.)

SondeHub Amateur (tracks radiosondes launched by amateur radio operators and hobbyists.)

Space/NASA Launches

Planned launches occur regularly all over the globe. These tracks can help identify the potential missions or launches in your area.

SpaceLaunchSchedule.com

SpaceFlightNow.com

RocketLaunch.Live

Satellite Trackers

Satellite tracking can also be done in real-time with the aid of tracking maps. They are also helpful for tracking Starlink launches.

Heavens Above

N2YO

Satellitemap.space

Spot the Station (International Space Station)

Space Weather

There are a number of sites which track solar flares, magnetic storms, asteroids, and other events which are helpful for eliminating explanations related to astronomic phenomena.