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D2S2 makes use of four coordinate systems:
Each coordinate system has an associated camera, from which the D2S2 simulation can be viewed.
The Earth-Centred Inertial (ECI) coordinate frame is an inertial coordinate frame that has its origin fixed to the Earth's centre of mass.
The coordinate frame is defined by, and fixed with respect to the celestial sphere. Specifically, D2S2 makes use of the J2000 ECI reference frame. The \(X\) axis is aligned with the mean vernal equinox at the reference epoch, and the \(Z\) axis is aligned with the Earth's rotation axis as it was at the reference epoch.
The 
button in D2S2 fixes the simulation camera to the ECI coordinate frame.
The ECEF (Earth Centred, Earth Fixed) coordinate system is a non-inertial frame with the origin fixed at the center of mass of the Earth.
Its axes are denoted with \(z'\), \(x'\) and \(y'\).
The \(z'\) axis aligns with the rotation axis of the Earth, and the \(x'-y'\) plane coincides with Earth's equatorial plane. D2S2 uses the ITRF reference frame as ECEF frame. Latitude, longitude and altitude conversion makes use of the WGS84 reference ellipsoid.
The 
button in D2S2 fixes the simulation camera to the ECEF coordinate frame.
The orbit reference frame rotates with the orbit of the spacecraft so that the \(Z_{o}\) reference axis points towards nadir, the \(X_{o}\) reference axis points towards the velocity vector, and the \(Y_{o}\) axis points along the orbit anti-normal.
An illustration of the orbit reference frame is shown in Figure 2.
Using the orbital reference frame within D2S2 will cause the camera track the satellite's translation, but not its rotation.
To select the orbital reference frame in D2S2, press the 
button.
Figure 2: The orbit reference frame axes.
The satellite body coordinate (SBC) system is a non-inertial coordinate reference frame that is fixed to the satellite body.
The SBC systems is nominally aligned with the orbit coordinate system when roll, pitch and yaw equal zero.
As such, the camera will rotate with the satellite when this reference frame is selected.
An illustration of the SBC reference frame is shown in Figure 3.
To view the satellite within the SBC reference frame in D2S2, press the button.
Figure 3: The spacecraft body coordinate (SBC) reference frame axes.
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To help explain things as clearly as possible in this Privacy Policy, every time any of these terms are referenced, are strictly defined as:
We collect information from you when you visit our service, register, place an order, subscribe to our newsletter, respond to a survey or fill out a form.
Any of the information we collect from you may be used in one of the following ways:
We receive some information from the third parties when you contact us. For example, when you submit your email address to us to show interest in becoming our customer, we receive information from a third party that provides automated fraud detection services to us. We also occasionally collect information that is made publicly available on social media websites. You can control how much of your information social media websites make public by visiting these websites and changing your privacy settings.
We may share the information that we collect, both personal and non-personal, with third parties such as advertisers, contest sponsors, promotional and marketing partners, and others who provide our content or whose products or services we think may interest you. We may also share it with our current and future affiliated companies and business partners, and if we are involved in a merger, asset sale or other business reorganization, we may also share or transfer your personal and non-personal information to our successors-in-interest.
We may engage trusted third party service providers to perform functions and provide services to us, such as hosting and maintaining our servers and our service, database storage and management, e-mail management, storage marketing, credit card processing, customer service and fulfilling orders for products and services you may purchase through our service. We will likely share your personal information, and possibly some non-personal information, with these third parties to enable them to perform these services for us and for you.
We may share portions of our log file data, including IP addresses, for analytics purposes with third parties such as web analytics partners, application developers, and ad networks. If your IP address is shared, it may be used to estimate general location and other technographics such as connection speed, whether you have visited the service in a shared location, and type of device used to visit the service. They may aggregate information about our advertising and what you see on the service and then provide auditing, research and reporting for us and our advertisers.
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We will collect personal information that you submit to us. We may also receive personal information about you from third parties as described above.
By submitting your email address on our service, you agree to receive emails from us. You can cancel your participation in any of these email lists at any time by clicking on the opt-out link or other unsubscribe option that is included in the respective email. We only send emails to people who have authorized us to contact them, either directly, or through a third party. We do not send unsolicited commercial emails, because we hate spam as much as you do. By submitting your email address, you also agree to allow us to use your email address for customer audience targeting on sites like Facebook, where we display custom advertising to specific people who have opted-in to receive communications from us. Email addresses submitted only through the order processing page will be used for the sole purpose of sending you information and updates pertaining to your order. If, however, you have provided the same email to us through another method, we may use it for any of the purposes stated in this Policy. Note: If at any time you would like to unsubscribe from receiving future emails, we include detailed unsubscribe instructions at the bottom of each email.
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We take precautions to protect the security of your information. We have physical, electronic, and managerial procedures to help safeguard, prevent unauthorized access, maintain data security, and correctly use your information. However, neither people nor security systems are foolproof, including encryption systems. In addition, people can commit intentional crimes, make mistakes or fail to follow policies. Therefore, while we use reasonable efforts to protect your personal information, we cannot guarantee its absolute security. If applicable law imposes any non-disclaimable duty to protect your personal information, you agree that intentional misconduct will be the standards used to measure our compliance with that duty.
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Cookies
We use Cookies to enhance the performance and functionality of our
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Via Email: info@dawndusk.space