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How To Determine Seeing and Transparency
Submitted: Friday, 15th April 2005 by Brendan Gazzard

Transparency

Adapted from "Transparency Scale" by the American Association of Amateur Astronomers.

Transparency graded on a 7 point scale and has been adapted for use in the Southern hemisphere. 

Score

Descriptor

Description

Visual test

0

Completely clouded out

possible light precipitation

no stars visible

1

Very Poor

cloud covering most of sky

momentary patches of clear sky

2

Poor

patchy cloud or heavy haze

alpha and / or beta Crux visible

3

Some what clear

Cirrus or Moderate haze

α, β, γ Crux visible

4

Partly clear

slight haze

α, β, γ, δ Crux visible

5

Clear

no clouds

Milky way visible by averted vision, α, β, γ, δ, ε crux visible

6

Very Clear

no clouds little sky glow, very little light pollution

Milky way visible, all stars of Crux visible plus coal sack

7

Extremely Clear

no clouds, minimal sky glow, Dark skies

ω Centauri and 47 Tucanae visible to naked eye

 

Seeing

Antoniadi Scale (seeing)

Score

Description

I.

Perfect, no movement of the image even at high magnification (100X plus)

II.

Slight quiver with calm moments lasting several seconds

III.

Moderate quiver with larger tremors, blurring of image

IV.

Poor constant undulation of image

V.

Very Bad not able to make even a rough sketch of image

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