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Universal Solar Chart Shadow Plotter And Method For Plotting A Shadow

Summary

An Apparatus For Estimating A Shadow On A Scaled Figure Is Presented Herein. The Apparatus Includes A Circular Disk With A Lines Corresponding To The Declination Angle Of The Earth With Respect To The Sun At Particular Dates Of The Year. The Apparatus Also Includes Arcs On The Circular Disk Which Correspond To The Earth's Rotation At Particular Times Of The Day. The Circular Disk Can Also Have A Slot To Facilitate Insertion Of A Pencil Or Pen Time Therein. The Circular Disk Is Substantially Transparent To Enable A User To Lay The Disk Over A Scaled Figure And Make Calculations And Measurements Corresponding To A Shadow To Be Estimated. Also Disclosed Is A Method For Estimating A Shadow For A Structure Depicted In A Scaled Figure. The Circular Disk Is Placed Over The Scaled Figure Such That The Slot In The Disk Is Aligned With An Azimuth Of The Sun So As To Trace A Shadow Line. The Circular Disk Is Then Reoriented Perpendicular To The Shadow Line So That A Scaled Height Line May Be Traced. The Circular Disk Is Then Relocated So That The Center Of The Slot Is Located At The End Of The Scaled Height Line. The Circular Disk Is Then Rotated To An Angle Corresponding To The Height Of The Sun And A Projection Line Is Traced In The Slot From The End Of The Scaled Height Line To The Shadow Line. In This Manner, The Length Of The Shadow For A Given Azimuth And Altitude Can Be Determined.

Supplementary Information

Patent Number: US6449854B1
Application Number: US2000705983A
Inventor: Cheung, Kwok Pun
Priority Date: 3 Nov 2000
Priority Number: US6449854B1
Application Date: 3 Nov 2000
Publication Date: 17 Sep 2002
IPC Current: G09B002504
US Class: 033268 | 033562 | 033015C
Assignee Applicant: The University of Hong Kong
Title: Universal solar chart shadow plotter and method for plotting a shadow
Usefulness: Universal solar chart shadow plotter and method for plotting a shadow
Summary: For estimating position and dimension of shadow cast by building or other structures.
Novelty: Shadow estimation apparatus for architectural designing application, has rotatable circular disk which is attached to angular plate to view features of design diagram, when it is placed on diagram

Industry

Architecture/Construction

Sub Group

Architecture

Application No.

US2000705983A

Country/Region

Hong Kong

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