---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 10/25/16: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:21 AM - Yet another Smartphone app for Aviation (rampil) 2. 11:59 AM - Re: Yet another Smartphone app for Aviation (Rowland Carson) ________________________________ Message 1 _____________________________________ Time: 07:21:36 AM PST US Subject: Europa-List: Yet another Smartphone app for Aviation From: "rampil" Hi All, Kerry at Lockwood has finally rebuild my 912s and I hope to get down to Bud's place to remount the engine and get back to flying within the next few months! In the mean time, I am still fiddling with code. First, let me note that the bug which prevented all barometer apps (think avAltimeter) from working in iOS 10 is now resolved in the newly released iOS 10.1. iOS 10.1 now prevents many apps from displaying landscape mode properly, but at least the altimeter is working! My new app is called Aviation Sunset Calculator in the App Store (on your device it will be "Civil Twilight" (it's shorter for display!)). This app provides all three night and day times required by FARs for night operation. What makes this app unique among the sunset apps already out there is that I perform all the celestial mechanics calculations inside the phone/iPad. Other apps use the internet to call out to the Naval Observatory or some other time server. Other useful features in this app include an internal database of all aerodromes with runways, worldwide, and the ability to change the the date forwards or backwards in time. If you do have an internet connection, you can even find the twilight times for any valid street address on earth. So, for example, you can use this app while airborne to find the expected twilight times at your destination. Since the FAA makes life interesting with regulations mandating three different times to reference for night operations, I also include the relevant FARs in the app's Help pages. The web page for this app is http://www.aviametrix.com/sunset/ The web page for the altimeter app is http://www.aviametrix.com The world-wide METAR app is at http://www.aviametrix.com/metar/avwx.html -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=461603#461603 ________________________________ Message 2 _____________________________________ Time: 11:59:06 AM PST US Subject: Re: Europa-List: Yet another Smartphone app for Aviation From: Rowland Carson On 2016-10-25, at 15:20, rampil wrote: > My new app is called Aviation Sunset Calculator in the App Store > I perform all the celestial mechanics > calculations inside the phone/iPad Ira - thanks for producing another handy app. You have a nice clean interface and show the essential info at a glance. You say "This app provides all three night and day times required by FARs but I can only see 2 sets at present (Std & Civ). As, in UK, Im not inside FAA jurisdiction maybe it leaves out one? When I read that you determine the answers by computation rather than lookup, I wondered if you were using the code published by Jeffrey Sax based on work by Jean Meeus, but I see from the credits that its a different (public-domain) source. I bought Jeans book Astronomical Algorithms over 20 years ago, with the companion disc (available at the time on both 3.5 and 5.25 discs!) that had source code written by Jeffrey Sax in Turbo Pascal, QuickBasic and C. The disc was IBM-PC formatted but I was able to read and use the C listings on my Mac LC475. I had a licence to use the code in non-commercial distributions and I got as far as getting the Calendar (sun & moon rise & set) program running on a glass teletype interface using Think C. However, I never did get around to putting a proper GUI on the front of it - should have been building the aeroplane anyway instead of fiddling with code! Anyway, your app does the job nicely and I applaud your work in developing it. If youre at a loose end you might consider adding nautical & astronomical twilight :-) in friendship Rowland | Rowland Carson ... that's Rowland with a 'w' ... | http://www.rowlandcarson.org.uk | Skype, Twitter: rowland_carson Facebook: Rowland Carson ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.