Bring water and sugar to a boil while stirring. Reduce heat and simmer a couple of minutes until sugars dissolved. Let cool.
Combine Aperol, Prosecco, lemon juice and orange juice. Add sugar water.
Place thinly sliced oranges in popsicle molds then fill molds approx 3/4 the way. Insert sticks and freeze for 4-6 hours at least.
To remove popsicles, run water on the mold for a few seconds then gentle pull to release.