Telescope magnification
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Astronomy and sky observation calculators
25 calculators. Search or choose one below.
Calculators
Telescope exit pupil
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Telescope true field of view
Field-stop tangent-plane geometry, no apparent-field/magnification approximation.
Astronomy and sky observation ↗Telescope angular resolution
Diffraction criterion only; seeing and aberrations excluded.
Astronomy and sky observation ↗Astronomy camera pixel scale
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Astronomy sensor sky coverage
Tangent-plane rectangle; area is not exact spherical solid angle.
Astronomy and sky observation ↗Star trail exposure estimate
Geometric central-field estimate for a fixed camera; projection and optical blur are excluded.
Astronomy and sky observation ↗Sidereal drift timing
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Angular object size
Spherical object; observer outside sphere.
Astronomy and sky observation ↗Small-angle distance estimate
Small-angle approximation, maximum angle one degree.
Astronomy and sky observation ↗Distance-to-modulus calculator
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Stellar magnitude flux ratio
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Combined stellar magnitude
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Telescope limiting magnitude comparison
Relative ideal comparison; not an absolute prediction of faint-object visibility.
Astronomy and sky observation ↗Astronomy exposure stacking signal
Independent equal frames and ideal calibration; correlated noise excluded.
Astronomy and sky observation ↗Dark frame library coverage
Per-setting inventory; each row is a distinct user-calibrated exposure/temperature setting.
Astronomy and sky observation ↗Astronomy mosaic coverage
Rectangular fixed-orientation small-field mosaic; no spherical projection or rotation correction.
Astronomy and sky observation ↗Equatorial coordinate format
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Hour angle converter
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Altitude from equatorial coordinates
No atmospheric refraction correction.
Astronomy and sky observation ↗Airmass approximation
Plane-parallel estimate, limited to altitude ≥10 degrees; refraction/curved atmosphere excluded.
Astronomy and sky observation ↗Synodic period
Coplanar constant prograde mean motions.
Astronomy and sky observation ↗Kepler orbital semimajor axis
Two-body Newtonian solar-unit model, using AU-year-solar-mass normalization.
Astronomy and sky observation ↗Orbital eccentricity from apsides
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Astronomy and sky observation ↗Astronomical redshift conversion
Radial Doppler equivalent in vacuum; not a cosmological recession-distance estimate.
Astronomy and sky observation ↗No matches. Try a shorter search or another category.