Before I show you the somewhat imprecise method I used to arrive at this result, I want to remind you that the challenge was to work out the amount of extra daylight we get here in Nova Scotia **per day **between the winter and summer equinoxes, using only this ‘sun graph’ from www.timeanddate.com (but NOT the data table below it!) . Why? Because “everybody loves the sunshine” and I fricking love this graph!:

**NB: If you look down on the very same page you will also find tables of sunrise & sunset data for each month, from which you can easily calculate your daily ration of extra daylight pretty accurately, and check the value you found for the average amount.**

## My Method

- I loaded the sun-graph into Geogebra.
- Located the approximate position of the summer equinox (2 thirds of the way from June to July on the horizontal axis
- I placed points at the top and bottom of the vertical axis, to enable me to measure the vertical size of the graph.
- I put another pair of points at the top and bottom of the daylight portion, so I could measure that.
- I compared the length of DE to that of CF (24 hours): so daylength = 24 x DE/CF
- Daylength = 24 x 2.53/3.86 =
**15.73 hours**(LAtex would look better!) I did the same for the winter equinox, 21st December giving me: daylength = 24 x 1.42/3.87 =**8.81 hours** - I found the difference in the daylength for the equinoxes: 15.73 – 8.81 =
**6.92 hours** - Divided total difference by the number of days in half a year: 6.92 / (365/2) = 0.0379 hours per day
- Put this into a more helpful unit (seconds!): 0.0379 x 60 =
**2.275 mins per day** - Converted 0.275 minutes to seconds: 0.275 x 60 = 16.5 seconds

## My answer: we get on average 2 minutes and 17 seconds per day of extra daylight

What answer did you get? Write a comment below to share or ask for help.

## LINKS

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