Notice to Mariners Published on May 21, 2024May 20, 2024 by fivecolorssandt@icloud.com Software updates A system of correction and new information long predates digital computers. Read More
Breadcrumbs Published on March 5, 2024March 4, 2024 by fivecolorssandt@icloud.com Not even suggestions Our tutor’s activities sometimes depart from the syllabus. Read More
Talk about the weather Published on November 8, 2022November 6, 2022 by fivecolorssandt@icloud.com Altostratus and a falling barometer Why would you do your own weather forecasting? Read More
Alphabetical order Published on March 2, 2021March 1, 2021 by fivecolorssandt@icloud.com An historical mistake We highlight an instance in which not knowing one’s history led to mistakes in astrophysics. Read More
Make a map Published on February 9, 2021February 7, 2021 by fivecolorssandt@icloud.com Charts, surveys and catalogs We notice the importance of what and where. Read More
Archives and old software Published on April 14, 2020April 13, 2020 by fivecolorssandt@icloud.com Looking again We find ourselves agreeing with Antoine de Saint-Exupéry. Read More
Celestial navigation Published on August 21, 2018August 21, 2018 by fivecolorssandt@icloud.com Knowing where you are You can get turn-by-turn directions. What more do you need? Read More
Maps and apps Published on December 5, 2017December 6, 2017 by fivecolorssandt@icloud.com In principle and in practice Another way we may be inadvertently changing how we see the world. Read More