TD Snap® vs Zero Shadow Day

TD Snap® is a flexible, robust communication software for people with speech and language disabilities such as autism, cerebral palsy and aphasia. Created by Tobii Dynavox, a leader in augmentative and alternative communication (AAC), TD Snap provides a choice of evidence-based, professionally developed page sets designed to meet different communication needs and preferences, with both symbol-supported and text-based options. TD Snap includes easy-to-use editing tools to create a personalized experience, and is accessible via touch, eye gaze and switch access methods. A monthly subscription is required to enable speech following a 1-month trial period. Tobii Dynavox offers complementary resources to help communicators, caregivers, and professionals succeed with TD Snap. These resources can be found by visiting myTobiiDynavox.com or tobiidynavox.com. Have you purchased a Tobii Dynavox device and looking to use your companion TD Snap license on an iOS device? Download this app and log into myTobiiDynavox in the start-up wizard. Customizable TD Snap Page Sets: • Core First: A symbol-supported page set enabling a path to literacy at any stage of language development, now also available in High contrast • Motor Plan: A symbol-supported page set enabling efficient language acquisition at any age, custom designed for both touch and eye gaze • Express: A symbol-supported page set to help people express themselves using theme-based phrases and words, now also available in bilingual Spanish/English • Text: A page set for those who are literate or transitioning from symbol supports to literacy • Scanning: A page set for those who use scanning as their primary access method, • Aphasia: A page set to help adults with aphasia communicate while also supporting language recovery , now also available in bilingual Spanish/English • PODD*: A page set based on the Pragmatic Organization Dynamic Display vocabulary strategy, developed by AAC expert Gayle Porter • Gateway*: A page set based on the Gateway vocabulary strategy, developed by Joan Bruno *Denotes in-app purchase of an additional monthly subscription per page or symbol set. Developed by a third party. Powerful Set of Integrated TD Snap Tools: • Editing: An intuitive editing tool to help customize buttons to meet a communicator’s unique needs • Diversity: A variety of diversity settings that let you customize skin tone, hair shades, and more • PCS: A built-in library of over 75,000 Picture Communication Symbols translated into over 25 languages • Search: A search bar to locate words and symbols with an easy and accessible path to find them • Visual Supports: A set of supports like visual schedules, timers, and scripts • Google Assistant: An integrated tool enabling symbol-supported access to Google Assistant • QuickFires: A set of commonly used pre-programmed phrases to make communication smoother • myTobiiDynavox: A cloud-based resource for backing up, sharing, and syncing customized content. How Subscriptions Work Following the 1-month free trial, your Apple ID payment method on file will automatically be charged monthly unless you cancel 24 hours before the trial ends. Subsequent monthly payments will be charged to your Apple ID payment method 24 hours before the end of each period. Your subscriptions are managed in account settings on the App Store. TD Snap® is a trademark and registered trademark of Tobii Dynavox AB. Tobii Dynavox cannot guarantee compatibility of TD Snap with any non-Tobii Dynavox brand of hardware and will not offer technical support for compatibility issues. All downloads are governed by TD Snap License Agreement for Download.

Between the Tropic of Cancer and the Tropic of Capricorn, the Sun passes exactly overhead twice a year. On those two days, at local noon, a vertical pole casts no shadow at all. That is a Zero Shadow Day. Zero Shadow Day tells you when yours is, and shows you why it happens. ZSD FINDER Your two zero shadow dates, with the exact local time of each, and how far you are from the equator and from the tropic. Tap anywhere on the world map to ask the same question of any other place. LOCAL NOON The moment the Sun is highest where you are — rarely 12:00, and the reason why is worth knowing. SHADOW LENGTHS The shadow of a one-meter pole through the whole day, drawn as a curve. Drag the time, drag the latitude, and watch the curve answer. SHADOW FOR YEAR The same shadow across all 365 days, so the two zero-crossings appear where the curve touches zero. ANIMATIONS Watch the zero shadow line sweep north and south across the Earth through the year, and see the equation of time and the analemma — the figure of eight the Sun traces in the sky. VISUALISATIONS The celestial sphere in three dimensions: the Sun's daily arc, the celestial equator and the ecliptic, from your own latitude. ZERO SHADOW MOMENT A globe showing where on Earth the Sun is directly overhead right now. Run it forward and follow the point around the world. Every calculation runs on your device. There are no accounts, no advertising and no tracking of any kind. Sharing your location is optional — pick a city from the list instead and everything works the same. Available in English, Hindi, Marathi, Tamil, Telugu, Kannada, Gujarati, Spanish and Portuguese, with a language switch inside the app. Made by Alok Mandavgane for the Public Outreach and Education Committee of the Astronomical Society of India, in support of its Zero Shadow Day campaign.