In short, here are examples of 'standard' questions with standard answers':

Q: When is the sunbathing time to get vitamin D intake?

A: Around 08 to 10:00 am.

Then Expert questions;

Q: When is the sunbathing time for the city of Jakarta on June 22, and how long is the recommended time for sunbathing?

A; The answer is;

Starting at 08, max exposure. 3 hours
Starting at 09, max exposure. 2 hours
Starting at 10, max exposure. 45 minutes
Starting at 11, max exposure. 26 minutes
From 12 o'clock, max exposure. 20 minutes
Starting at 13, max exposure. 26 minutes
Starting at 14, max exposure. 45 minutes
Starting at 15, max exposure. 2 hours
Starting at 16, max exposure. 3 hours

Expert questions require expert answers. How to?

To answer this question you need the Global UV Index .

The BMKG website always releases the Daily UV Index (Ultra Violet Index), with a video display of the Indonesia map accompanied by changes in color over time on the same day.

Meanwhile, by understanding the Global UI Index , you will understand the daily Ultra Violet exposure of various cities around the world. Very useful if you want to travel abroad or help colleagues in other cities. For example in the case;

What time is Vit D exposure in London winter? or
Summer Cappadocia?
Mecca mid-December?
Best Time For Umrah, Hajj, Religious Tourism?

FYI, Vitamin D deficiency affects almost 50% of the population worldwide. An estimated 1 billion people worldwide, across all ethnicities and age groups, have vitamin D deficiency (VDD).

Sun exposure with a UV index of 6-7 is good for increasing vitamin D but is very risky for skin health.

Ultra Violet Index

Indexes uv		Danger risk	Protector
0 – 2	Green	"Low"	sunglasses, broad spectrum SPF 15+ sunscreen.
3 – 5	Yellow	"Currently"	UV-resistant sunglasses, wide hat. Broad spectrum SPF 15+ sunscreen every 1.5 hours,
6 – 7	Orange	"Height"	UV-resistant Sunglasses, Wide hat. Broad spectrum SPF 15+ sunscreen every 1.5 hours. Better take shelter.
8 – 10	Red	"Very high"	UV-resistant Sunglasses, Wide hat. Broad spectrum SPF 15+ sunscreen every 1.5 hours. Better take shelter.
11+	Young	"Extreme"

So it is very important to know the Daily Ultra Violet Index Scale and the recommended Length of Exposure .

The steps for using the Global UV Index are quite simple, namely;

Navigate the desired date and month ( Ecliptic ) according to the Sun Arrow; e.g. June 22 (See Fig;Green color).
Determine the latitude of the desired location, for example Jakarta -6.5 (can be searched with the Google Maps application ). This position of Latitude -6.5 will then become the 12 o'clock position . (View image;Red)
Determine the Closest Distance between 12 Hours to the Horizon line (North/South). Horizon Line is 06:00 Local Time. Between the Horizon Line (06 Hours) and 12 Hours, it is divided into 6 sections to be filled in successively at 11, 10, 9, 8, 7 with the same size. (See Figure;Blue)

The results are as follows;

How to Read it;

Starting at 08, max exposure. 3 hours
Starting at 09, max exposure. 2 hours
Starting at 10, max exposure. 45 minutes
Starting at 11, max exposure. 26 minutes
From 12 o'clock, max exposure. 20 minutes
Starting at 13, max exposure. 26 minutes
Starting at 14, max exposure. 45 minutes
Starting at 15, max exposure. 2 hours
Starting at 16, max exposure. 3 hours

Easy huh?

The following is a video tutorial on how to use it

Hopefully with the Global UV Index , we all become diligent in sunbathing and know when it's right to sunbathe

The GLOBAL UV Index file can be found on Google Book , to get a PDF file for printing, you can contact the e-mail nafanakhun @gmail.com

You will quickly understand that on certain dates in certain cities , there are times when UV rays are safe throughout the day (morning – midday – evening; for example Mecca or Medina in December ) or even certain cities aregetting no Ultra Violet exposure at allin a few days.

So hopefully useful

Nafan Akhun

DISCLAIMER

Global UV Index – Assuming Clear Sky, Elevation of the Ground Surface is the same and flat, Ozone is thin, No Local Time Correction to GMT ( Greenwich Mean Time )

LOCAL TIME CORRECTION

Time Correction; 1° = 4 minutes