It looks like you're searching for a tool to calculate field of view (FOV) for astrophotography or astronomy, with "hot" perhaps meaning popular or currently recommended.
. Outside, the desert air was finally cooling, but his gear was still "hot"—thermal noise from a long day in the sun meant his sensor wouldn't be ready for hours. He needed to find the perfect target for tonight’s "hot" streak of clear skies. He pulled up the Field of View (FOV) Calculator astro+fov+calculator+hot
Imaging Mode: Essential for astrophotography. You input your telescope’s focal length and your camera sensor's dimensions (or select from a database of popular models like those from ZWO) to see how a target like the Orion Nebula will be framed. Top-Rated Tools (The "Hot" Options) It looks like you're searching for a tool