Title
Orbit Determination and Statistical Study of Visual Binaries,Used
Delivery time: 8-12 business days (International)
The determination of visual binary orbits is the problem of computing orbital elements of a binary from a set of observed positions. There are several methods of orbit computations, and they fall into two categories namely geometrical methods and analytical methods. The firsts are quicker but lead to fewer certain values of the elements. About 60 to 80 orbits are computed each year throughout the world. More than half are improvements of former orbits. Of the 800 or 900 orbits now published, only a few score have definitive elements. The reasons for this difficulty beside the errors in the measures are : 1 The lack of existing orbit determination algorithms that can deal with what we call it extreme cases of visual binary orbits like for examples ,parabolic orbits, hyperbolic orbits, quasi parabolic orbits and others. So the determination of these orbits will certainly increases the available orbital elements. 2 Three observations (necessary and sufficient data for orbit determination may define a (possible empty ) set of Keplerian orbits whose corresponding apparent orbits pass through those points.
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For more information, please visit www.P65Warnings.ca.gov.
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Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
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This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.