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Buy from Amazon $110.43$2.95 $125.00 $100.00 $75.00 $50.00 $25.00 Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $97.48, Dec 17 - Dec 25$96.50, Dec 27 - Jan 5$95.53, Jan 6 - Jan 28$94.57, Jan 29 - Jul 31$94.57, Jan 29 - Jul 31$90.57, May 3 - May 5$34.37, May 3 2:32 pm$94.57, Jan 29 - Jul 31$90.55, May 6 - May 8$34.24, May 6 7:10 am$94.57, May 8 - May 22$94.57, Jan 29 - Jul 31$34.08, May 8 1:50 pm$94.57, May 8 - May 22$94.57, Jan 29 - Jul 31$33.98, May 10 7:43 am$94.57, May 8 - May 22$94.57, Jan 29 - Jul 31$33.49, May 12 4:00 pm$94.57, May 8 - May 22$94.57, Jan 29 - Jul 31$33.32, May 15 2:00 am$94.57, May 8 - May 22$94.57, Jan 29 - Jul 31$33.00, May 19 7:31 pm$94.57, May 8 - May 22$94.57, Jan 29 - Jul 31$32.86, May 21 3:03 pm$94.57, Jan 29 - Jul 31$90.57, May 23 - May 26$32.80, May 24 5:28 am$94.57, Jan 29 - Jul 31$90.57, May 23 - May 26$32.76, May 26 2:03 am$94.57, May 27 - Jun 3$94.57, Jan 29 - Jul 31$32.62, May 28 1:58 pm$94.57, May 27 - Jun 3$94.57, Jan 29 - Jul 31$33.25, May 30 - Jun 1$94.57, May 27 - Jun 3$94.57, Jan 29 - Jul 31$33.50, Jun 2 4:51 am$94.57, Jan 29 - Jul 31$92.88, Jun 3 - Jun 16$33.48, Jun 3 11:03 pm$94.57, Jan 29 - Jul 31$92.88, Jun 3 - Jun 16$33.44, Jun 5 11:22 am$94.57, Jan 29 - Jul 31$92.88, Jun 3 - Jun 16$33.29, Jun 8 3:43 pm$94.57, Jan 29 - Jul 31$92.88, Jun 3 - Jun 16$33.19, Jun 10 6:23 pm$94.57, Jan 29 - Jul 31$92.88, Jun 3 - Jun 16$33.08, Jun 13 12:17 am$94.57, Jan 29 - Jul 31$92.88, Jun 3 - Jun 16$32.96, Jun 15 6:26 am$94.57, Jan 29 - Jul 31$90.57, Jun 16 - Jun 17$32.86, Jun 17 12:57 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.80, Jun 19 1:50 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.79, Jun 22 1:20 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.70, Jun 24 8:18 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.53, Jun 26 4:45 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.36, Jun 29 1:25 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.22, Jun 30 3:30 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$32.03, Jul 3 12:01 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$31.86, Jul 5 7:47 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$31.68, Jul 8 1:13 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$31.56, Jul 9 6:14 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$31.33, Jul 11 5:29 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$31.08, Jul 14 8:34 am$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$30.96, Jul 15 4:01 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$30.78, Jul 18 1:58 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$30.52, Jul 21 1:10 pm$94.57, Jan 29 - Jul 31$92.88, Jun 18 - Jul 23$30.36, Jul 23 8:00 pm$94.57, Jan 29 - Jul 31$94.46, Jul 25 4:06 pm$30.23, Jul 25 4:06 pm$94.57, Jan 29 - Jul 31$94.06, Jul 27 10:35 am$30.12, Jul 27 10:35 am$94.57, Jan 29 - Jul 31$92.86, Jul 30 9:11 am$29.91, Jul 30 9:11 am$93.62, Aug 1 - Aug 18$92.26, Aug 1 4:48 am$29.84, Aug 1 4:48 am$93.62, Aug 3 - Aug 18$93.62, Aug 1 - Aug 18$29.78, Aug 3 11:02 pm$93.62, Aug 3 - Aug 18$93.62, Aug 1 - Aug 18$33.96, Aug 5 - Aug 11$93.62, Aug 3 - Aug 18$93.62, Aug 1 - Aug 18$33.90, Aug 12 8:51 pm$93.62, Aug 3 - Aug 18$93.62, Aug 1 - Aug 18$33.81, Aug 14 7:32 pm$93.62, Aug 3 - Aug 18$93.62, Aug 1 - Aug 18$33.75, Aug 16 9:31 pm$93.62, Aug 3 - Aug 18$93.62, Aug 1 - Aug 18$33.71, Aug 18 12:14 am$92.68, Aug 19 - Aug 24$92.68, Aug 19 - Aug 24$33.55, Aug 21 9:58 pm$92.68, Aug 19 - Aug 24$92.68, Aug 19 - Aug 24$33.48, Aug 23 9:33 pm$91.75, Aug 26 12:18 am$91.75, Aug 26 - Aug 31$33.36, Aug 26 12:18 am$91.75, Aug 26 - Aug 31$90.00, Aug 27 - Sep 18$33.22, Aug 28 5:10 am$91.75, Aug 26 - Aug 31$90.00, Aug 27 - Sep 18$33.12, Aug 30 11:35 am$90.83, Sep 1 - Sep 7$90.00, Aug 27 - Sep 18$32.99, Sep 1 8:13 pm$90.83, Sep 1 - Sep 7$90.00, Aug 27 - Sep 18$32.67, Sep 4 6:15 am$90.83, Sep 1 - Sep 7$90.00, Aug 27 - Sep 18$32.63, Sep 6 3:09 pm$90.83, Sep 1 - Sep 7$90.00, Aug 27 - Sep 18$32.60, Sep 7 7:28 pm$90.67, Sep 8 - Nov 1$90.00, Aug 27 - Sep 18$32.73, Sep 10 5:09 am$90.67, Sep 8 - Nov 1$90.00, Aug 27 - Sep 18$32.67, Sep 12 1:06 pm$90.67, Sep 8 - Nov 1$90.00, Aug 27 - Sep 18$32.65, Sep 14 11:05 am$90.67, Sep 8 - Nov 1$90.00, Aug 27 - Sep 18$32.57, Sep 16 11:26 am$90.67, Sep 8 - Nov 1$90.00, Aug 27 - Sep 18$32.74, Sep 18 - Oct 5$90.67, Sep 8 - Nov 1$89.64, Sep 20 1:33 pm$32.74, Sep 18 - Oct 5$90.67, Sep 8 - Nov 1$88.94, Sep 22 8:05 pm$32.74, Sep 18 - Oct 5$90.67, Sep 8 - Nov 1$87.98, Sep 25 12:21 am$32.74, Sep 18 - Oct 5$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$32.74, Sep 18 - Oct 5$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$32.15, Oct 7 11:21 am$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$31.92, Oct 9 2:27 pm$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$30.91, Oct 11 4:39 pm$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$30.52, Oct 13 7:27 pm$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$29.31, Oct 15 11:17 pm$90.67, Sep 8 - Nov 1$90.00, Sep 27 - Oct 18$28.15, Oct 18 2:47 am$90.67, Sep 8 - Nov 1$89.70, Oct 20 7:27 am$27.69, Oct 20 7:27 am$90.67, Sep 8 - Nov 1$89.32, Oct 22 12:57 pm$26.48, Oct 22 12:57 pm$90.67, Sep 8 - Nov 1$89.04, Oct 27 1:55 am$23.90, Oct 27 1:55 am$90.67, Sep 8 - Nov 1$88.84, Nov 1 6:17 am$22.33, Nov 1 6:17 am$97.88, Nov 8 - Dec 13$88.16, Nov 8 4:01 am$19.39, Nov 8 4:01 am$97.88, Nov 8 - Dec 13$87.16, Nov 13 12:04 pm$16.95, Nov 13 12:04 pm$97.88, Nov 8 - Dec 13$86.44, Nov 17 10:11 am$15.74, Nov 17 10:11 am$97.88, Nov 8 - Dec 13$85.98, Nov 20 1:33 am$15.19, Nov 20 1:33 am$97.88, Nov 8 - Dec 13$85.78, Nov 22 - Nov 24$14.68, Nov 22 3:39 am$97.88, Nov 8 - Dec 13$85.50, Nov 26 3:39 am$14.14, Nov 26 3:39 am$97.88, Nov 8 - Dec 13$85.38, Nov 28 1:27 am$13.66, Nov 28 1:27 am$97.88, Nov 8 - Dec 13$85.34, Nov 29 11:41 pm$13.20, Nov 29 11:41 pm$97.88, Nov 8 - Dec 13$85.14, Dec 1 11:15 pm$13.15, Dec 1 11:15 pm$97.88, Nov 8 - Dec 13$84.94, Dec 3 9:05 pm$12.69, Dec 3 9:05 pm$97.88, Nov 8 - Dec 13$85.36, Dec 5 7:17 pm$12.63, Dec 5 7:17 pm$97.88, Nov 8 - Dec 13$84.36, Dec 7 6:09 pm$12.20, Dec 7 6:09 pm$97.88, Nov 8 - Dec 13$89.21, Dec 11 9:03 pm$11.73, Dec 11 9:03 pm$97.88, Nov 8 - Dec 13$88.69, Dec 13 9:01 pm$19.24, Dec 13 9:01 pm$103.78, Dec 14 - Dec 21$88.35, Dec 14 8:41 pm$19.22, Dec 14 8:41 pm$103.78, Dec 14 - Dec 21$90.00, Dec 16 - Jan 1$19.17, Dec 16 7:35 pm$110.43, Dec 23 - Dec 27$90.00, Dec 16 - Jan 1$17.64, Dec 23 3:27 am$110.43, Dec 23 - Dec 27$90.00, Dec 16 - Jan 1$17.16, Dec 25 1:50 am$110.43, Dec 23 - Dec 27$90.00, Dec 16 - Jan 1$16.41, Dec 27 8:20 am$109.88, Dec 29 - Jan 1$90.00, Dec 16 - Jan 1$15.97, Dec 29 1:53 am$109.88, Dec 29 - Jan 1$90.00, Dec 16 - Jan 1$15.42, Dec 30 3:59 pm$109.88, Dec 29 - Jan 1$90.00, Dec 16 - Jan 1$15.39, Jan 1 6:33 am$109.32, Jan 9 - Jan 10$89.40, Jan 9 2:52 pm$14.93, Jan 9 2:52 pm$108.77, Jan 12 - Jan 18$79.86, Jan 12 2:16 am$14.87, Jan 12 2:16 am$108.77, Jan 12 - Jan 18$79.34, Jan 13 1:36 pm$14.85, Jan 13 1:36 pm$108.77, Jan 12 - Jan 18$78.32, Jan 15 6:05 am$14.81, Jan 15 6:05 am$108.77, Jan 12 - Jan 18$77.50, Jan 18 2:06 pm$14.73, Jan 18 2:06 pm$108.22, Jan 20 - Jan 25$74.37, Jan 20 5:54 am$14.71, Jan 20 5:54 am$108.22, Jan 20 - Jan 25$73.39, Jan 23 11:00 am$14.65, Jan 23 11:00 am$108.22, Jan 20 - Jan 25$72.89, Jan 25 2:47 am$14.59, Jan 25 2:47 am$108.11, Jan 26 - Feb 1$72.33, Jan 26 6:29 pm$14.55, Jan 26 6:29 pm$108.11, Jan 26 - Feb 1$86.50, Jan 30 - Feb 15$14.49, Jan 30 5:45 am$108.11, Jan 26 - Feb 1$86.50, Jan 30 - Feb 15$14.43, Feb 1 1:23 am$108.10, Feb 2 - Apr 23$86.50, Jan 30 - Feb 15$14.93, Feb 2 10:04 pm$108.10, Feb 2 - Apr 23$86.50, Jan 30 - Feb 15$32.74, Feb 4 - Feb 23$108.10, Feb 2 - Apr 23$90.00, Feb 17 - Mar 13$32.74, Feb 4 - Feb 23$108.10, Feb 2 - Apr 23$90.00, Feb 17 - Mar 13$32.75, Feb 24 - Mar 19$108.10, Feb 2 - Apr 23$89.55, Mar 17 1:22 am$32.75, Feb 24 - Mar 19$108.10, Feb 2 - Apr 23$89.33, Mar 19 5:25 am$32.75, Feb 24 - Mar 19$108.10, Feb 2 - Apr 23$89.13, Mar 21 9:45 am$32.73, Mar 21 9:45 am$108.10, Feb 2 - Apr 23$88.65, Mar 23 3:41 pm$32.67, Mar 23 3:41 pm$108.10, Feb 2 - Apr 23$88.07, Mar 25 11:56 pm$32.61, Mar 25 11:56 pm$108.10, Feb 2 - Apr 23$87.63, Mar 28 7:09 am$32.55, Mar 28 7:09 am$108.10, Feb 2 - Apr 23$87.15, Mar 30 3:32 pm$32.53, Mar 30 3:32 pm$108.10, Feb 2 - Apr 23$86.61, Apr 2 4:11 am$32.43, Apr 2 4:11 am$108.10, Feb 2 - Apr 23$86.29, Apr 4 6:23 pm$32.12, Apr 4 6:23 pm$108.10, Feb 2 - Apr 23$84.57, Apr 7 8:53 am$31.71, Apr 7 8:53 am$108.10, Feb 2 - Apr 23$90.00, Apr 10 - Apr 15$31.10, Apr 10 2:24 am$108.10, Feb 2 - Apr 23$90.00, Apr 10 - Apr 15$30.52, Apr 12 8:48 pm$108.10, Feb 2 - Apr 23$90.00, Apr 10 - Apr 15$29.93, Apr 15 5:03 pm$108.10, Feb 2 - Apr 23$89.75, Apr 18 6:30 am$29.44, Apr 18 6:30 am$108.10, Feb 2 - Apr 23$88.65, Apr 20 11:42 pm$28.86, Apr 20 11:42 pm$108.10, Feb 2 - Apr 23$87.69, Apr 23 4:12 pm$28.35, Apr 23 4:12 pm$108.10, Apr 26 - May 19$86.57, Apr 26 8:35 pm$27.72, Apr 26 8:35 pm$108.10, Apr 26 - May 19$77.46, Apr 29 - May 19$27.14, Apr 29 6:00 pm$108.10, Apr 26 - May 19$77.46, Apr 29 - May 19$26.90, May 2 11:43 am$108.10, Apr 26 - May 19$77.46, Apr 29 - May 19$26.86, May 5 - May 12$108.10, Apr 26 - May 19$77.46, Apr 29 - May 19$26.85, May 15 1:19 pm$108.10, Apr 26 - May 19$77.46, Apr 29 - May 19$26.66, May 19 6:47 pm$103.90, May 23 9:57 pm$77.08, May 23 9:57 pm$26.31, May 23 9:57 pm$104.55, May 28 5:47 am$75.84, May 28 5:47 am$25.92, May 28 5:47 am$104.57, Jun 1 8:50 pm$75.71, Jun 1 8:50 pm$25.51, Jun 1 8:50 pm$104.08, Jun 6 11:59 am$76.04, Jun 6 - Jun 18$24.95, Jun 6 11:59 am$104.83, Jun 10 - Jun 18$76.04, Jun 6 - Jun 18$17.92, Jun 10 4:25 pm$104.83, Jun 10 - Jun 18$76.04, Jun 6 - Jun 18$2.95, Jun 14 12:27 pm$104.83, Jun 10 - Jun 18$76.04, Jun 6 - Jun 18$2.98, Jun 18 - Jul 21$104.82, Jun 22 - Jun 25$77.11, Jun 22 12:45 am$2.98, Jun 18 - Jul 21$104.82, Jun 22 - Jun 25$76.61, Jun 25 - Jun 29$2.98, Jun 18 - Jul 21$104.81, Jun 29 9:33 pm$76.61, Jun 25 - Jun 29$2.98, Jun 18 - Jul 21$104.80, Jul 4 - Jul 24$74.90, Jul 4 2:57 am$2.98, Jun 18 - Jul 21$104.80, Jul 4 - Jul 24$75.19, Jul 8 1:16 pm$2.98, Jun 18 - Jul 21$104.80, Jul 4 - Jul 24$74.14, Jul 13 12:45 pm$2.98, Jun 18 - Jul 21$104.80, Jul 4 - Jul 24$74.12, Jul 17 7:56 am$2.98, Jun 18 - Jul 21$104.80, Jul 4 - Jul 24$72.65, Jul 21 1:08 am$2.98, Jun 18 - Jul 21$104.80, Jul 4 - Jul 24$72.75, Jul 24 2:38 pm$20.00, Jul 24 - Jul 28$104.27, Jul 28 - Jul 31$72.71, Jul 28 3:50 am$20.00, Jul 24 - Jul 28$104.27, Jul 28 - Jul 31$72.77, Jul 31 6:29 pm$19.67, Jul 31 6:29 pm$103.75, Aug 4 - Aug 8$72.03, Aug 4 - Aug 26$20.00, Aug 4 - Sep 26$103.22, Aug 11 - Aug 15$72.03, Aug 4 - Aug 26$20.00, Aug 4 - Sep 26$102.70, Aug 19 - Sep 15$72.03, Aug 4 - Aug 26$20.00, Aug 4 - Sep 26$102.70, Aug 19 - Sep 15$71.44, Aug 30 - Sep 15$20.00, Aug 4 - Sep 26$104.12, Sep 19 - Sep 22$71.38, Sep 19 12:14 am$20.00, Aug 4 - Sep 26$104.12, Sep 19 - Sep 22$71.20, Sep 22 10:23 pm$20.00, Aug 4 - Sep 26$103.60, Sep 26 - Sep 30$70.96, Sep 26 8:06 pm$20.00, Aug 4 - Sep 26$103.60, Sep 26 - Sep 30$70.70, Sep 30 - Oct 4$30.50, Sep 30 - Oct 4$103.07, Oct 4 - Oct 9$70.70, Sep 30 - Oct 4$30.50, Sep 30 - Oct 4$103.07, Oct 4 - Oct 9$71.70, Oct 9 12:31 am$32.75, Oct 9 - Oct 24$102.55, Oct 13 12:49 am$72.84, Oct 13 - Oct 20$32.75, Oct 9 - Oct 24$102.04, Oct 16 - Oct 20$72.84, Oct 13 - Oct 20$32.75, Oct 9 - Oct 24$101.52, Oct 24 - Oct 28$72.05, Oct 24 - Oct 28$32.75, Oct 9 - Oct 24$101.52, Oct 24 - Oct 28$72.05, Oct 24 - Oct 28$32.74, Oct 28 2:43 pm$101.37, Nov 1 - Dec 1$71.06, Nov 1 2:01 pm$32.69, Nov 1 2:01 pm$101.37, Nov 1 - Dec 1$72.20, Nov 5 - Nov 9$32.64, Nov 5 4:12 pm$101.37, Nov 1 - Dec 1$72.20, Nov 5 - Nov 9$32.58, Nov 9 6:30 pm$101.37, Nov 1 - Dec 1$70.87, Nov 13 - Nov 27$32.52, Nov 13 9:01 pm$101.37, Nov 1 - Dec 1$70.87, Nov 13 - Nov 27$26.98, Nov 18 4:28 am$101.37, Nov 1 - Dec 1$70.87, Nov 13 - Nov 27$24.84, Nov 22 1:53 pm$101.37, Nov 1 - Dec 1$70.87, Nov 13 - Nov 27$24.44, Nov 27 1:38 am$101.37, Nov 1 - Dec 1$70.93, Dec 1 10:28 pm$23.96, Dec 1 10:28 pm$83.40, Dec 6 7:38 pm$70.57, Dec 6 7:38 pm$23.40, Dec 6 7:38 pm$70.57, Dec 6 7:38 pm$64.67, Dec 11 8:30 pm$22.90, Dec 11 8:30 pm$70.57, Dec 6 7:38 pm$49.94, Dec 16 10:17 pm$22.49, Dec 16 10:17 pm$70.57, Dec 6 7:38 pm$38.86, Dec 21 8:02 pm$22.06, Dec 21 8:02 pm$70.57, Dec 6 7:38 pm$37.47, Dec 27 7:43 am$21.40, Dec 27 7:43 am$70.57, Dec 6 7:38 pm$29.56, Jan 1 12:27 am$21.02, Jan 1 12:27 am$70.57, Dec 6 7:38 pm$48.48, Jan 5 6:55 pm$20.65, Jan 5 6:55 pm$70.57, Dec 6 7:38 pm$49.17, Jan 8 6:50 am$20.43, Jan 8 6:50 am$101.38, Jan 13 - Jan 28$66.99, Jan 13 4:57 am$20.01, Jan 13 4:57 am$101.38, Jan 13 - Jan 28$65.76, Jan 18 5:35 am$19.58, Jan 18 5:35 am$101.38, Jan 13 - Jan 28$64.68, Jan 23 6:25 am$19.16, Jan 23 6:25 am$101.38, Jan 13 - Jan 28$66.78, Jan 28 - Feb 2$18.74, Jan 28 8:43 am$92.31, Feb 2 8:00 am$66.78, Jan 28 - Feb 2$18.70, Feb 2 8:00 am$74.69, Feb 7 9:36 am$68.56, Feb 7 9:36 am$18.36, Feb 7 9:36 am$68.56, Feb 7 9:36 am$65.28, Feb 12 2:16 pm$17.75, Feb 12 2:16 pm$68.56, Feb 7 9:36 am$58.96, Feb 18 12:01 am$17.25, Feb 18 12:01 am$68.56, Feb 7 9:36 am$49.24, Feb 23 1:52 pm$16.65, Feb 23 1:52 pm$68.56, Feb 7 9:36 am$43.46, Feb 28 10:06 pm$15.86, Feb 28 10:06 pm$101.38, Mar 12 10:27 pm$67.71, Mar 12 10:27 pm$13.71, Mar 12 10:27 pm$98.63, Mar 24 10:03 pm$67.75, Mar 24 - Apr 17$12.56, Mar 24 - Apr 5$88.46, Apr 5 9:52 am$67.75, Mar 24 - Apr 17$12.56, Mar 24 - Apr 5$84.89, Apr 17 2:46 am$67.75, Mar 24 - Apr 17$12.57, Apr 17 2:46 am 190,4002,451,014 2,734,375 1,822,917 911,458 0 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Latest $84.89 Apr 17, '16
Highest $110.43 Dec 23, '14
Lowest $29.56 Jan 1, '16
Average $93.50 (30d avg)
$81.03 (90d avg)
$80.65 (180d avg)
$92.82 (365d avg)
$95.66 (Lifetime average)
Added Dec 17, 2013

3rd Party New

Latest $67.75 Apr 17, '16
Highest $94.57 May 27, '14
Lowest $64.68 Jan 23, '16
Average $67.75 (30d avg)
$67.66 (90d avg)
$69.27 (180d avg)
$72.09 (365d avg)
$80.64 (Lifetime average)
Added Dec 17, 2013

3rd Party Used

Latest $12.57 Apr 17, '16
Highest $34.41 May 3, '14
Lowest $2.95 Jun 14, '15
Average $12.56 (30d avg)
$15.83 (90d avg)
$20.88 (180d avg)
$20.16 (365d avg)
$23.86 (Lifetime average)
Added Dec 17, 2013

Sales Rank

30 day average: 1,387,463
90 day average: 1,498,218

Product Description

This is an introductory textbook on spherical and positional astronomy. It is entirely suitable for use by students with no prior knowledge of classical astronomy. At the same time, it is sufficiently comprehensive to make it a useful background reference book for anyone engaged in practical astronomy. The first three chapters sketch essential background: mathematical techniques and coordinate systems. Successive chapters then give treatments of refraction, aberration, stellar parallex, precession, nutation and proper motion. An entire chapter is devoted to astrographic plate measurements. The gravitational two-body problem is solved and applied to solar system dynamics. Novel areas include a full treatment of binary star orbits and two chapters on developments in radio astronomy. Worked examples and problems to be solved by the reader ensure that this is a valuable textbook.

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