Hello Jos,
  The concept of a leap year is a purely human invention to make minor 
adjustments to our calendar year as it slowly gets out of sync with the solar 
year, and as far as I know there is no way for a sundial to 'know' about leap 
years.
Thank you,
Paul Ratto
SunClocks North America
438-793-6161
sunclock...@icloud.com
www.sunclocks.net

> On Aug 28, 2014, at 4:06 AM, "Jos Kint" <jos.k...@telenet.be> wrote:
> 
> Has anyone an idea how to use a sundial for calculating if the current year 
> is a leap year? And, if not, how many years we are behind the next leap year?
>  
> Jos Kint, 50°59’ N ; 3°39’E
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