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Sight Reduction Form (HO 249 and NAO) 1. Sight # DR Position DR L (N/S) DR Lo (W/E) 2. Time Celestial Body Local Date WT: H M S ZD (E/W+) H GMT WT H M S WE (F/S+) ( ) M S GMT: H M S GMT Date 3a. Almanac.

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In astronavigation, sight reduction is the process of deriving from a sight, (in celestial navigation usually obtained using a sextant), the information needed for establishing a line of position, generally by intercept method.

Sight Reduction Tables are used in celestial navigation to "reduce" (analyze) the "sights" (data obtained from a sextant at known times) in order to find your latitude and longitude.

The HO229 tables are more accurate by one decimal place, due to the data in the HO249 tables are rounded to the whole degree. In addition, the HO249 are limited to declinations up to 29° (volumes 2 and 3) and 80° (volume 1). The HO229, on the other hand, does not have this restriction.

Step-by-step sight reduction Start with Hs, the angle that you read off of your sextant. Apply the index correction. Correct for height of eye using the dip table on the inside front cover of the Nautical Almanac. ... Determine and apply the main sun correction from the inside front cover of the Nautical Almanac.

They are designed to facilitate the practice of celestial navigation at sea. The tables are primarily used with the intercept method of sight reduction by entering arguments of latitude, declination and local hour angle and obtaining tabulated altitudes and azimuth angles.

The Intercept (Marcq Saint-Hilaire) Method The Marcq Saint-Hilaire or intercept method is the most popular way to reduce a sight for a line of position.

Your observed measurements with the sextant, combined with data from these tables allow you to obtain the necessary coordinates to plot a Line of Position with some simple addition and subtraction. This process, called a sight reduction, is guided by the Sight Reduction Form.

The Nautical Almanac Sight Reduction Method. The NASR method uses concise sight reduction tables that are included as part of the Nautical Almanac. Hence, an advantage of the NASR method is that it enables sights to be reduced using a tabular method with only one volume.

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Form Packages
Adoption
Bankruptcy
Contractors
Divorce
Home Sales
Employment
Identity Theft
Incorporation
Landlord Tenant
Living Trust
Name Change
Personal Planning
Small Business
Wills & Estates
Packages A-Z
Form Categories
Affidavits
Bankruptcy
Bill of Sale
Corporate - LLC
Divorce
Employment
Identity Theft
Internet Technology
Landlord Tenant
Living Wills
Name Change
Power of Attorney
Real Estate
Small Estates
Wills
All Forms
Forms A-Z
Form Library
Customer Service
Terms of Service
DMCA Policy
About Us
Blog
Affiliates
Contact Us
Privacy Notice
Delete My Account
Site Map
All Forms
Search all Forms
Industries
Forms in Spanish
Localized Forms
Legal Guides
Real Estate Handbook
All Guides
Prepared for You
Notarize
Incorporation services
Our Customers
For Consumers
For Small Business
For Attorneys
Our Sites
US Legal Forms
USLegal
FormsPass
pdfFiller
signNow
airSlate workflows
DocHub
Instapage
Social Media
Call us now toll free:
1-877-389-0141
As seen in:
  • USA Today logo picture
  • CBC News logo picture
  • LA Times logo picture
  • The Washington Post logo picture
  • AP logo picture
  • Forbes logo picture
© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232