Transit Depth Calculator
The light from an exoplanet transit is quite faint. When animations depict transits, they makes it seem like planet blocks out the star like a … Read More
JSCalc
Planet Equilibrium Temperature Calculator
You see a dot of light in the night sky. Is it hot or cold? That’s a question that require physics, not poetry. To answer … Read More
Habitable Zone Distance Calculator
The habitable zone may seem like a straightforward ring around a star, but it’s actualy a moving target depending on temperament of the star itself. … Read More
NPF Rule Exposure Calculator
You took a great picture of the Milky Way, but there’s one thing bugging you: the little star trails poking out in the corner. You … Read More
500 Rule Exposure Calculator
Patience is required when shooting the night sky; there’s always a trade off between sharpness and light gathering. You’ve focused manually, balanced your ISO, and … Read More
Pixel Scale Calculator for Astrophotography
You’ve saved up for months, searching and scrounging for just the right telescope to put outside and new camera sensor to go into it. After … Read More
Camera Field of View for Astrophotography Calculator
There’s a certain kind of frustration that comes with learning how to take astrophotos: After three hours of exposure time, you realize the object you … Read More
Limiting Magnitude of a Telescope Calculator
You’ve got one of those moment when your eyes see one thing but your brain won’t believe it because you know there should be something … Read More
Telescope Light Gathering Power Calculator
It is an experience to look at something for the first time with a telescope, seeing things that could never be seen by the unaided … Read More
Exit Pupil Calculator for Telescopes
There you are, standing behind eyepiece looking through at Saturn’s rings. What you see is blurry. And dark. Did you get the telescope wrong? Is … Read More