Angular separation of the three stars of the
Summer Triangle
The following measurments were made on September 1,
2019 from my back yard in Aurora Colorado,
using the
Cross Staff. All
measurements are within 10% of the separations predicted by Stellarium.
| Star Pair | Cross Staff scale/reading | Observed Separation | Stellarium Prediction |
| Vega - Altair | E-26.4 | 37o | 34.2o |
| Vega - Deneb | E-39.1 | 24o | 23.8o |
| Deneb - Altair | E-23.6 | 41o | 38.0o |
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