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Abstract: This article investigates a fixed-time simultaneous arrival (FTSA) problem in terms of the equilibrium of path lengths of unmanned vehicles. A novel trajectory elliptical homotopy method ...

Abstract: This article proposes a geometric-based method of the ground-point visibility from a satellite or satellite constellation in elliptical orbit considering the J 2 perturbation. First, the ...

(WLOS) — Tonight marks the beginning of a stretch of back-to-back supermoons that continues into next year. A supermoon is a full moon that occurs at perigee, the location in its elliptical orbit that ...

Four back-to-back Supermoons will grace the night sky to end the year and start 2026, beginning with the Harvest full Moon this week. The Moon will be at its fullest just before midnight on Tuesday, ...

Hubble has captured a striking new image of NGC 2775, a galaxy that defies easy classification. Blending features of spirals, ellipticals, and lenticulars, its puzzling structure may be the result of ...