Eddie's Math and Calculator Blog

HP 35S: Length of Sunlight During a Day Source: Total Daily Amount of Solar Radiation - HP 67/97 Energy Conservation Pac, December 1978,...

HP 35S: Air Density & Density Altitude (7 Digit Accuracy*) *You can use 4 or 5 digits for the HP 15C and other RPN calculators on whic...

HP35S Distance to Horizon Calculator: HP 35S Sources: * HP 65 Navigation Pac-1 - published in 1974 * Bad Astronomy by Discovery Magazine:...

HP35S Vertical Curve: Elevation at Peak and Length Source: Fundamental of Engineering Supplied-Reference Handbook 8th Ed, 2nd Revisio...

HP 35S: Horizontal Curve Original: HP 33S Surveying Applications, Hewlett Packard, March 1978, pg. 46 Calculator HP 35S Input (see diag...

Thanks to the University of Texas at San Antonio Computer Science Department. The explanation and formulas can be found by clicking on th...

I am in Carpinteria, CA; soon to be headed back home (vacation goes by soooooooo fast!) Last night was a sight to see. Unfortunately I did ...

Greetings from San Luis Obispo. I am on vacation this week having a great time! So far I visited Morro Bay (what a sight - despite the p...

I hope everyone is doing well today! I am coming to you form Java House Coffee Shop in Montrose, CA. This morning I went to the Glendale ...

HP 39gii Programming Tutorial - Part 8: Functions as Arguments Apologies for the delay. In part 8, I will show you several was you can us...

I have a small collection of slide rules. Slide rules, which first made their appearance in the 1620s, was the calculator before electron...

There will be a Part 8 of the HP 39gii calculator tutorial series. I plan to have it posted by next week. Part 8 will involve programs t...

Hi everyone! I am at a local Starbucks. Love the coffee shop atmosphere - and coffee. Way I doing today and over the next few weeks is ta...

TI-84 Plus Color Silver Edition Review The changes are mostly positive as TI takes another step forward while maintaining the classic syst...