Can you predict when Manhattanhenge will occur this year?

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SUMMARY

The Manhattanhenge phenomenon occurs when the setting sun aligns perfectly with the street grid of New York City. In 2023, the key dates for this event are May 29 at 8:13 p.m., May 30 at 8:12 p.m., July 12 at 8:20 p.m., and July 13 at 8:21 p.m. To predict these dates, one can utilize the latitude of Manhattan (41.2° N) and the amplitude of the street grid's tilt (29°). By applying the formula sin (DECLINATION) = cos (LATITUDE) sin (AMPLITUDE), the Sun's declination can be calculated, allowing for accurate predictions of the event.

PREREQUISITES
  • Understanding of celestial mechanics and solar positioning
  • Familiarity with trigonometric functions and their applications
  • Knowledge of Manhattan's geographic coordinates
  • Ability to interpret astronomical data from almanacs or analemmas
NEXT STEPS
  • Research the mathematical principles behind solar declination calculations
  • Explore the use of astronomical almanacs for predicting solar events
  • Learn about the historical significance of Manhattanhenge and its cultural impact
  • Investigate software tools for simulating solar positions, such as Stellarium
USEFUL FOR

Astronomy enthusiasts, urban planners, photographers, and anyone interested in celestial events and their alignment with urban landscapes will benefit from this discussion.

BillTre
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Manhattanhenge
Weather permitting and proper location, you might be able to celebrate the alignment of the Cosmos, as the New York City's founders planned in all their ancient wisdom!

Tues., May 29, 8:13 p.m. Eastern Daylight Time
Wed., May 30, 8:12 p.m. Eastern Daylight Time
or
Thurs., July 12, 8:20 p.m. Eastern Daylight Time
Fri., July 13, 8:21 p.m. Eastern Daylight Time
 
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The Manhattanhenge events are two summer sunsets and two winter sunrises.
I can look up Manhatten's latitude,
latitude = 41.2° N
and equate the amplitude to the known tilt of the street grid from the cardinal directions,
amplitude = 29°
and using
sin ( DECLINATION ) = cos ( LATITIDE ) sin ( AMPLITUDE ), to find the Sun's declination,
alignment declination = 21.3939° north or south
Compare this to an almanac or an analemma ( find one on image search ) and then predict the 4 dates.
 

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