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A canopy adapted to be mounted on a chair having a backrest. This canopy is supported by a frame including a closed loop rod and an open arc rod, each rod made of flexible material. The canopy also includes a first sheet secured throughout its entire perimeter to the closed loop rod and a second she

A canopy adapted to be mounted on a chair having a backrest. This canopy is supported by a frame including a closed loop rod and an open arc rod, each rod made of flexible material. The canopy also includes a first sheet secured throughout its entire perimeter to the closed loop rod and a second sheet secured along its back edge to the top edge of the first sheet and along its front edge to at least a portion of the open arc rod. The canopy also includes anchors configured to attach said canopy to said chair's backrest. The canopy can be compactly collapsed by folding the first sheet over the second sheet, thereby forming a stack, twisting the stack into three sets of loops, shifting the left loops in front of the right loops and folding the middle loops in front of the left loops.

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1. A canopy, adapted for use with a chair having a backrest, comprising: b) a frame comprising two members, namely a closed loop rod and an open arc rod, each made of flexible material, said open arc rod having two ends;c) a first sheet secured throughout its entire perimeter to said closed loop rod

1. A canopy, adapted for use with a chair having a backrest, comprising: b) a frame comprising two members, namely a closed loop rod and an open arc rod, each made of flexible material, said open arc rod having two ends;c) a first sheet secured throughout its entire perimeter to said closed loop rod, first sheet having a top edge, two sides and a bottom edge;d) a second sheet comprising a top edge and a bottom edge such that: i. the middle of said bottom edge of said second sheet is joined by an attachment to the middle of said top edge of said first sheet, said attachment of said bottom edge of said second sheet to said first sheet includes all of said top edge of said first sheet and extends symmetrically down both said sides of said first sheet towards said bottom edge of said first sheet, andii. said top edge of said second sheet completely confines said open arc rod; ande) one or more anchors configured to attach said canopy to said chair's backrest. 2. The chair canopy of claim 1 wherein said second sheet has the general shape of two equal size trapezoids joined along their longest parallel edges. 3. The chair canopy of claim 1 wherein said anchors comprise one or more elastic bands attached to said first sheet. 4. The chair canopy of claim 1 further comprising a flexible rib extending along said second sheet between said top edge of said second sheet and said bottom edge of said second sheet. 5. The chair canopy of claim 4 further comprising a permanent rib attachment adjacent to either said top edge of said second sheet or to said bottom edge of said second sheet. 6. The chair canopy of claim 5 further comprising two detachable rib attachments on said second sheet, first of said detachable rib attachments positioned adjacent to said top edge of said second sheet, and second of said detachable rib attachments positioned adjacent to said bottom edge of said second sheet thereby allowing said rib to be deployed when said canopy is in use or folded away when said canopy is folded. 7. The chair canopy of claim 4 also comprising a sleeve configured to store the rib. 8. The chair canopy of claim 1 further comprising a mechanism for maintaining said canopy in a compact configuration. 9. The chair canopy of claim 8 wherein said anchor is configured to attach said canopy to a chair and maintain said canopy in said compact configuration. 10. The chair canopy of claim 1 wherein said first sheet and said second sheet comprise sunlight blocking, shading or filtering material. 11. A method of folding said chair canopy of claim 1 comprising: f) folding said first sheet over said second sheet along their said attachment line, thereby forming a stack, said stack having a perimeter;g) holding said stack at a left point and at a right point along its said perimeter;h) twisting said stack clockwise at said left point along a first twisting axis, and twisting said stack counterclockwise at said right point along a second twisting axis, said first twisting axis and said second twisting axis forming an angle between 45 degrees and 135 degrees, thereby forming a stacked multiplicity of left loops, a stacked multiplicity of right loops and a stacked multiplicity of middle loops;i) sliding said multiplicity of left loops in front of said multiplicity of right loops;j) folding said multiplicity of middle loops in front of said multiplicity of left loops. 12. The chair canopy of claim 1 wherein a fringe is added along some of the perimeter of said second sheet. 13. The chair canopy of claim 1 further comprising window flaps cut into said second sheet.