International Photographers Association of Los Angeles 洛杉磯國際攝影家協會

http://digitalphotobuzz.com/ipad-app-review-lighttrac

“LightTrac is a must have tool for any outdoor photographer interested in knowing the best times to shoot their subjects outdoors. Whether you are a landscape photographer or wedding photographer or a nature photographer, use this to find out Sun's elevation and direction over any outdoor subject at any time of day. Use it to scout for new locations ahead of time. Use this tool to be there at the right spot at the right time. Sun's azimuth and elevation changes throughout the year depending on which hemisphere you are located, so this is useful even if you think you know your spots well.

This app also displays the different phases of the moon in the month and also the current phase of the moon. Sun, moon event times and position data are all calculated by the app and they are found to be very closer to the chart published by US navy (http://aa.usno.navy.mil/data/docs/RS_OneYear.php)”

评价不错，
貌似LightTrac 已从市场上消失，太可惜了。
我手上的 lighttrac 成了绝版。
希望有其他的developer出个类似的东西来。