Variables used: TILT: the angle between the Earth's axis of rotation and the normal of the ecliptic (23.5 degrees) LAT: observer's latitude (use positive values for Northern latitudes, negative values for Southern latitudes) SEAS: the current season, given as an angle between 0 and 360 degrees, with 0 being mid-winter in the Northern hemisphere, 90 being the Northern Spring equinox, etc. SOLVE program to compute the height of the sun above the horizon. Coordinates should be entered in decimal degrees distance is computed in kilometers. SOLVE program to compute the Great Circle Distance between two points on the Earth.
Set DEG mode in DPLOT, use YMIN=-1, YMAX=1, AXIS=0, XMIN=0, XMAX=180. Modified version of DPLOT like the original, with SOLVE support added.Ĭalculates sin(x) * sin(5*x). Original version of DPLOT from the HP-42S manual. Set DEG and ALL modes in PLOT, use YMIN=-0.5, YMAX=2, AXIS=0, XMIN=-360, XMAX=360, XINC=45.
Original version of MISCFN from the HP-42S manual.Ĭalculates (x/360) * sin(3*x) + 1 used to demonstrate the PLOT program. Modified version of PLOT like the original, with SOLVE support added. Original version of PLOT from the HP-42S manual. Programs for Free42s/Hp42s (taken from Thomas Okken website): Trek Star Trek game written originally for the HP-42Sīlack Jack Black Jack game adatpted from the HP-41C The Caves Adaptation of a classic HP-41C game Okie Dokie Graphical puzzle game converted from the Atari 2600 Minehunt game Graphical minehunt game for the HP-42S Miller-Rabin Primality Test Primality test for integers up to 999 999 999 999.īig Factorial Aproximate factorials (N!) for N larger than 253.įind the root, min and max of a function using Newton's algorithmįind the roots of two nonlinear equations using Newton's algorithmįind the roots of several nonlinear equations using Newton's algorithm Prime Number Factorisation Factorises integers up to 99 999 999 QPI Approximate decimal numbers by fractions on various forms A great software repository for HP42s is the Mathematics
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