Question: The programs work on monitors day in and day out for near untraceable period to time. What is the best position to keep the monitor?

Answer: 
The US Government's Occupational Safety & Health Administration (OSHA) provides [ergonomic recommendations for computer monitors](https://www.osha.gov/SLTC/etools/computerworkstations/components_monitors.html). There are a number of factors to consider, especially:

Monitor distance:

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> Sit at a comfortable distance from the monitor where you can easily read all text with your head and torso in an upright posture and your back supported by your chair. Generally, the preferred viewing distance is between 20 and 40 inches (50 and 100 cm) from the eye to the front surface of the computer screen.
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Monitor height:

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> The top of the monitor should be at or slightly below eye level. The center of the computer monitor should normally be located 15 to 20 degrees below horizontal eye level.
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> What is the best position to keep the monitor?
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Since people are not the same (and in many companies monitors are not the same), there is no one best position.

Some people are tall, some are short. Some people see close objects well, others don't. Some people have small monitors, some have large monitors, some have more than one.

Some monitors are attached to laptops, some are independent, some are touch-screens.

The best thing to do is to allow individuals to adjust their monitor(s) (and all other office equipment) to best suit their individual needs and preferences.

You can send around the government/OSHA recommendations as a starting point, but they are just recommendations. Use what works for individuals.