Bond angle of nitrous acid Why are there two possible bond angles for the nitrous acid molecule? 

After perusing Wikipedia I found that there are both cis and trans forms of the nitrous acid molecule. I also note that the cis form is sterically hindered. Could this be a reason for the two different bond angles - there are two different geometric isomers and in one case there are larger van der Waals repulsions, which in turn expands the bond angle?
This ism the microwave structure of nitrous acid, 1971.  Your mileage may vary condensed phase.

DOI:10.1039/TF9716702179 (1971)
The structure of cis-nitrous acid is found to be: O—H = 0.982, N—O(H)= 1.392, N—O = 1.185 Å, ∠ NOH = 104.0 and ∠ ONO = 113.6°, and for trans-nitrous acid: O—H = 0.958, N—O(H)= 1.432, N—O = 1.170 Å, ∠ NOH = 102.1 and ∠ ONO = 110.7°.

http://nzc.iap.ac.cn/uploadpdf/Wang_et_al._CSB_2007a.pdf 
  2007 pape with more recent citations.