Download this custom built macOS Mojave dynamic wallpaper and enjoy pictures of Earth from DSCOVR spacecraft on the day of December solstice of 2018 which was at 22:23 UTC on December 21st.
You can clearly see how much of Antarctica is visible at December solstice comparing to the previous dynamic wallpaper.
This wallpaper is prepared for the American Pacific time zone, so if you're not in the North American west coast you'd see the Earth not that well synced with your time. Please let us know if you want a separate version of this wallpaper synced with your time zone.
Also please check out my store Blue Marble Studio for mugs and other accessories with this beautiful Earth if you're interested.