File:Octagon mound astrolabe.jpeg

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Summary

"Newark Earthworks: The Great Circle and the Octagon Earthworks" by Deb Platt in 'TrekOhio' (14 May 2012) https://trekohio.com/2012/05/14/the-largest-geometric-earthworks-in-the-world/

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:54, 5 December 2022		1,024 × 768 (94 KB)	Jb (talk \| contribs)	"Newark Earthworks: The Great Circle and the Octagon Earthworks" by Deb Platt in 'TrekOhio' (14 May 2012) https://trekohio.com/2012/05/14/the-largest-geometric-earthworks-in-the-world/

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Image title	Octagon Earthworks: possible astronomical meaning
Camera manufacturer	Panasonic
Camera model	DMC-ZS6
Exposure time	1/40 sec (0.025)
F Number	f/3.9
ISO speed rating	200
Date and time of data generation	11:41, 1 May 2012
Lens focal length	9.1 mm
Orientation	Normal
Horizontal resolution	72 dpi
Vertical resolution	72 dpi
Software used	GIMP 2.6.12
File change date and time	22:28, 13 May 2012
Y and C positioning	Co-sited
Exposure Program	Normal program
Exif version	2.21
Date and time of digitizing	11:41, 1 May 2012
Meaning of each component	Y Cb Cr does not exist
Image compression mode	4
APEX exposure bias	0
Maximum land aperture	3.44 APEX (f/3.29)
Metering mode	Pattern
Light source	Unknown
Flash	Flash did not fire, compulsory flash suppression
Supported Flashpix version	1
Color space	sRGB
Sensing method	One-chip color area sensor
File source	Digital still camera
Scene type	A directly photographed image
Custom image processing	Normal process
Exposure mode	Auto exposure
White balance	Auto white balance
Focal length in 35 mm film	55 mm
Scene capture type	Standard
Scene control	Low gain up
Contrast	Normal
Saturation	Normal
Sharpness	Normal
Width	3,000 px
Height	4,000 px
Image width	3,000 px
Image height	4,000 px
Short title	Octagon Earthworks: possible astronomical meaning