#HORIZON LINE CALCULATOR HOW TO#
#HORIZON LINE CALCULATOR PLUS#

The reverse is also true, whilst rowing across the Atlantic, the very top of a mountain range 400m high could be seen on your horizon at a distance of 71.4 km assuming the air was clear enough.

Subtract Re 2 from both sides: d 2 h 2 + 2hRe. Expand the right hand side: d 2 + Re 2 h 2 + 2hRe + Re 2. Radio Line of Sight Calculator/VHF/UHF Here is a simple line of sight calculator that will do the complicated math for you to determine just how far the horizon is from your HT or your base station antenna at any height above level and flat ground (or calm water) on the VHF/UHF ham bands. Now we can use simple algebra to isolate the distance to the horizon (d).

Using the Pythagorean theorem, we know: d 2 + Re 2 (h + Re) 2. The computation uses an effective earth radius of. To get the total radio horizon d of the receiving and transmitting antennas (or effective communication range between the two antennas) their radio horizons are added: These formulas are used in our calculator. Sitting in a hotel room 10m above sea level a boat on the horizon will be 11.3km away. Re - the radius of the Earth at the horizon point. Rh horizonrange( H ) returns the horizon range, Rh, of a radar system H meters above the surface. The distance d from a receiving antenna to the horizon can be calculated using the same formulas.

#HORIZON LINE CALCULATOR PLUS#

Using Pythagoras's theorem we can calculate the distance from the observer to the horizon (OH) knowing CH is the earth's radius (r) and CO is the earth's radius (r) plus observer's height (v) above sea level. A triangle is formed with the centre of the earth (C) as one point, the horizon point (H) is a right angle and the observer (O) the third corner. Is it possible to calculate the theoretical line of sight having the following variables: Human Location: 49.836573, 24. It also assumes the horizon you are looking at is at sea level. This calculator assumes nothing is in the way of the radio signal between the antenna and the horizon at a chosen height above ground. Calculate line of sight Ask Question Asked 6 years, 5 months ago Modified 6 years, 5 months ago Viewed 2k times 0 I try to figure out if a satellite would be visible.

#HORIZON LINE CALCULATOR HOW TO#

This calculation should be taken as a guide only as it assumes the earth is a perfect ball 6378137 metres radius. How to Measure Sunset Time Stretch Your Hand Out in Front of You Line Up Your Pinky With the Horizon Count How Many Fingers Between the Horizon and the Sun. Here is a simple line of sight calculator that will do the complicated math for you to determine just how far the horizon is from your HT or your base station antenna at any height above level and flat ground (or calm water) on the VHF/UHF ham bands. Distance to the Horizon Calculator Observation Height in Metres in FeetĮnter the Height, set for Metres / Feet then click the Calculate button.

Horizon line calculator