Welcome to another addition of our newsletter. This issue we have a first solo flight, a look at what Sean has been up to in Swan Hills and a refresher on how to find out when legal daylight is.
Congratulations Mitch on your first solo flight!
Refresher -What is legal daylight?
Half hour before sunrise to half hour after sunset right? Not quite. If you take a look at the definitions in CARS you will find the following;
"day or daylight means the time between the beginning of morning civil twilight and the end of evening civil twilight; (jour)"
You can find out civil twilight by using the chart in the Aeronautical Information Manual (AIM). A link to the PDF is below. To get the time, you find your date, head up to your latitude and across to the time. Daylight however is not simply a function of your latitude. Your current longitude also changes this time.
To get an accurate time you must add (if West) or subtract (if East) 4 minutes for every degree you are from the standard meridian. For example, Whitecourt is approximately 54° North and 115° South. The standard meridian here is 105 W (see the twilight chart in the AIM for others).
If it is June 5th, head up the chart to 54 and across and you'll get a time of around 0240. Whitecourt is approximately 10 degrees West of 105 which gives us 40 minutes to add to our time to end up with 0320. The chart does not account for daylight saving so add an hour and you could be skids up bright and early at 0420 even though sunrise on the same day is 0514!
We've been helping out good friends at Ridge Rotors flying researchers all over the Swan Hills area. They are conducting a census of the Grizzly Bear population in the area. It's the first time it's been done here so nobody knows what kind of numbers to expect. We look forward to hearing the results.