Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Need formulas for arcsin and arctan
    From: Bill B
    Date: 2006 Mar 29, 22:59 -0500

    Lu wrote:
    > On the other hand, regardless of whether an angle is expressed as 45
    > degrees or Pi/4 radians, its sine and cosine are the same.   So scanning
    > down a table that expresses angles in degrees for a sine or cosine that
    > matches your calculation should give you arcsine(x) in degrees.
    > Whoops, in first paragraph should have said "You get radians by
    > MULTIPLYING the angle in degrees by 2*Pi/360.
    I am sorry, I did not express myself clearly.  I understand the conversion
    from degrees to rads to grads, and why engineers etc. find radians more
    What I am trying understand:  Is "arcsine" the *exact* equivalent of "sine
    ^-1" outside the kingdom of the pocket calculator today?  Specifically, it
    seems "arcsine" was the angle in radians.  If so, has that changed?
    For example, several decades ago--unless you could walk or stand on
    water--you could not walk or stand on a "dock."  (Hence the term "dry
    dock").  Gourmet was a noun, not an adjective.  Was arcsine exclusively
    refering to angle in radians, and is that the case or not today?
    Thanks again

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site