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Benvenuti in queste pagine dedicate a scienza, storia ed arte. Amelia Carolina Sparavigna, Torino

Wednesday, April 4, 2018

Astronomical Analysis of Diagonal Avenues of Washington


An Astronomical Analysis of Some of the Diagonal Avenues of Washington
PHILICA, 2016,Article 613 Available at SSRN
 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2789700

Amelia Carolina Sparavigna

Here we are proposing an astronomical analysis of the directions of some of the diagonal avenues of Washington, made by means of satellite images and a modern ephemeris, the Photographer’s Ephemeris, a well-known software used for planning outdoor photography. Some diagonal streets of Washington seem had been aligned along the northern moonrise azimuth of 1791, the year the engineer Pierre Charles L’Enfant started the survey for planning the town for George Washington, and along the southern moonrise azimuths of 1792, the year the surveyor Andrew Ellicott revised the plan. In this manner, in the directions of some diagonal avenues, the engineers that worked on the urban project, introduced a reference to the years of their plans for the Capital of the United States.
Keywords: Astronomy, Satellite Images, Architecture, Modern Ephemerides, Urban Planning


 Copy of the U.S. Coast and Geodetic Survey, Washington, D.C. (1887).

Detail of Figure 1, with some diagonal avenues of L’Enfant Plan and angles.

A detail of the faint original map of 1791 (https://www.loc.gov/item/88694205/) after a processing of the image.

Google map of Washington.

Snapshot of the Photographer s Ephemeris for Washington on October 3, 2015.  The blue lines are the moonrise and moonset azimuths, the yellow and orange lines those of sunrise and sunset. Note the coincidence to the diagonal avenues.

Snapshot of the Photographer s Ephemeris for Washington on October 3, 2015. 

  
Snapshot of the Photographer s Ephemeris for Washington on October 18, 2015.  

Shwedagon Pagoda and the Zenith Passage of the Sun on Vesak Day of Buddha

An article discusses the orientation of the Shwedagon Pagoda, the gilded stupa situated on Singuttara Hill in Yangon, Myanmar, and a possible link with the sunrise on the days of the zenith passage of the sun. These days are also linked to the Festival of the Full Moon of the month of Kason, the second month of the traditional Burmese calendar. In Myanmar, this is the festival of the Vesak Day of Buddha.

 PHILICA, 2018, Article number 1233.


The south-eastern side of Shwedagon Pagoda. Image Courtesy: Bjørn Christian Tørrissen


A monk is walking on the facade. Image Courtesy: Bjørn Christian Tørrissen.



Sunrise direction on the day of the Kason Festival, 29 April 2018 (Courtesy SunCalc.org).

Image Segmentation - Phloem and Xylem

Measuring the size of tubules in phloem and xylem of plants Philica, 2017, n.1104.The paper is showing how to measure, by means of the segmentation of a SEM image, the cross-sections of the tubules in phloem and xylem of plants. https://hal.archives-ouvertes.fr/hal-01578826