Next Ruby Project -- Rails Project -- Ephemeris

This is going to be my first rails web app, but I'm going to build the heart or the mechanics of it in Ruby first. This is my next big personal project. I'm putting it ahead of all other ones because this one has major usability.

What is Ephemeris?

Ephemeris is a program that calculates the phases of the moon and the time for sunrise, sunset, moonrise and moonset for any location on the planet. There's a lot of math I don't have a clue how to do involved.

So here are the end goals

By supplying your location (say Los Angeles) and a date you can get:

MoonPhase in a neat little graphic of the day
Sunrise, sunset, moonrise and moonset
Ability to create a moon calendar for the month(s) supplied.
Ability to create a sunrise/set moonrise/set table for month(s) supplied.
Give the exact time of full moon and new moon.
The all the times should be accurate to the timezone of your location.

First step is finding the math to calculate this and code it in Ruby. Then I'll create a rails app that will run this from a website.

Comments

Multiple Assignments in Ruby

In this Rails project I'm running I need to set a whole bunch of individual variables to 'disabled' at once depending on the group the current user belongs to. We can use multiple assignment in this case but with a caveat. Multiple assignments are a quick way of setting a lot of variables at once. h, k = 1,2 => [1,2] h => 1 k => 2 but h, k = 1 => 1 h => 1 k => nil In that case we can do this: h = k = 1 => 1 h => 1 h => 1 Beware this sets them to the same object. So if you change one you change both. h = k = [] h << 1 h => [1] k => [1] While we're at it here is how to reverse two variables: h = 1 k = 2 h,k = k,h h => 2 k => 1

What Medieval Economics can teach us about tariffs.

As a teen, I used to play Dungeons and Dragons (D&D) with my friends. This started an interest in the medieval period that led to me taking a medieval history class in college just to understand the period more. Over the years I've also read great books like " Dungeon, Fire and Sword " about the crusades (I recommend the book) and yet with all that knowledge it wasn't until recently that it occurred to me I had a completely wrong understanding of economics in the Medieval Period. "Viking helmets, sword and footwear" by eltpics is licensed under CC BY-NC 2.0 In my D&D games, players who are adventures battling monsters and creatures would need equipment and on the trips to town, they'd get resupplied with their adventuring necessities. I'd run these moments referencing my imagination of what it must have been and fantasy books I'd read. There be an inn with a raucous bar, a gruffly black-smith, if a city also a weapon and armor sm...

Setting up the Marble Mouse for Ubuntu

I have a Logitech trackball which I love. I bought it when my wrists started hurting after hours of long Photoshop sessions. The switch to the trackball fixed all that. It allows me to hold my hand in the perfect position and it's great for most browsing with one exception: It lacks a middle-click wheel. This presents a bigger problem than it seems, as design seems to be removing the scroll bars at the edges of windows in favor of small slits. So to get around this you can emulate a scroll wheel or use the middle click to activate a scroll motion on various programs. Logitech has a utility that sets this up in Windows but in Ubuntu you have a better (if more hard-work required) option. The Ubuntu option is better because unlike in Windows you can emulate the wheel with the track-ball by holding down a button. This is the option I like to use. In Ubuntu you write a configuration file to set up the trackball to work the way you want it. I have to re-create this...

David Acevedo's Blog

Search This Blog