Sunlight-meter (heliograph)

The base in Meteorology are the observations of the weather.

This is done by the weatherobservers around the world , at a same given time (Synop-observartion)

It could be done by automatic (computer-based) stations or by human manned stations.

There are also some difference between how they are done, or by whom they are done.

Often you will find professional staff at the airports, but also staff in the countryside or islands that are employed by their countries own regular state or military owened weather (met-office) services.

Some of these stations not only report meteorological data, they also give some climatical data too.

Not all, but some do, and in some cases, they also measure the rate of sunlighthours of the days.

How do you meet sunligh- hours in an trustwurthy method?

Well, it could be done by a heliograph. Some of these could be done by computerised UV-radiation indicators and registrators. And some of these have just an ordinary "crystalball".

Yes, a crystalball, that is like a magnifying-glass that burns a line on a paper.

The sunlight, makes a sharp burning ray of light when it passes through the glass,

and you can see the line as a burned line on a special-measured paper.

Simple and genious!

Once a day (24-hour) you change the paper, and then you send the report to your met-office.

These stations are often called climate- stations and not weatherstations, and these are not as close to each other as the ordinary weatherstations. These climate stations indicate were there has been a lot or less sunshine in that specific area. Do not get so happy or sad about the hours of sunlight reported by a station in or  your local neighborhood. The town next to you, maybe report something different, its just an indication.

Here is a Heliograph below, can you see the black paper?

And behind  the white cupboard ,with meteorological instuments like thermometers and hygrographical instuments.

 

Editor of the blog notes:
Sometimes I write in English and sometimes in Swedish. I have a lot of readers  and friends in USA and Europe, and I will try to continue to write in English.
It will be more convenient for you because most of the videoclips are American or in English.
I will try to do my best with the English, but sometimes there will occur
 grammatical errors.

So please make allowances for my Swedish-English.