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4
Seeing
Seeing .conditions .refers .to .the .stability .of .the .atmosphere .and .directly .affects .the .amount .of .fine .detail .
seen .in .extended .objects. .The .air .in .our .atmosphere .acts .as .a .lens .which .bends .and .distorts .incoming .
light . rays. . The . amount . of . bending . depends . on . air . density. . Varying . temperature . layers . have . different .
densities .and, .therefore, .bend .light .differently. .Light .rays .from .the .same .object .arrive .slightly .displaced .
creating .an .imperfect .or .smeared .image. .These .atmospheric .disturbances .vary .from .time-to-time .and .
place-to-place. .The .size .of .the .air .parcels .compared .to .your .aperture .determines .the .“seeing” .quality. .
Under .good .seeing .conditions, .fine .detail .is .visible .on .the .brighter .planets .like .Jupiter .and .Mars, .and .
stars .are .pinpoint .images. .Under .poor .seeing .conditions, .images .are .blurred .and .stars .appear .as .blobs. .
The .conditions .described .here .apply .to .both .visual .and .photographic .observations.
Seeing conditions directly affect image quality. These drawing represent a point
source (i.e., star) under bad seeing conditions (left) to excellent conditions (right).
Most often, seeing conditions produce images that lie some where between these
two extremes.
Bad
Excellent
FIG. 13
Содержание LightChariot 102AR-AZ
Страница 1: ...LightChariot INSTRUCTION MANUAL 8 0AR A Z 10 2 AR A Z 13 0 N A Z...
Страница 2: ...w w w s k y w a t c h e r u s a c o m...
Страница 42: ...42 APPENDIX D STANDARD TIME ZONES OF THE WORLD 26 APPENDIX A STANDARD TIME ZONES OF THE WORLD...
Страница 43: ...43 JANUARY FEBRUARY SKY MAP...
Страница 44: ...44 MARCH APRIL SKY MAP...
Страница 45: ...45 MAY JUNE SKY MAP...
Страница 46: ...46 JULY AUGUST SKY MAP...
Страница 47: ...47 SEPTEMBER OCTOBER SKY MAP...
Страница 48: ...48 NOVEMBER DECEMBER SKY MAP...
Страница 49: ...49 NOTES...
Страница 50: ...50 NOTES...
Страница 51: ...w w w s k y w a t c h e r u s a c o m...